Plans and preparation The plan of the Fifth Army commander, Lieutenant General Clark, was for the
British X Corps, under
Lieutenant General Richard McCreery, on the left of a thirty-kilometre (20 mi) front, to attack on 17 January 1944, across the Garigliano near the coast (
5th and
56th Infantry Divisions). The
British 46th Infantry Division was to attack on the night of 19 January across the Garigliano below its junction with the Liri in support of the main attack by
U.S. II Corps, under
Major General Geoffrey Keyes, on their right. The main central thrust by the U.S. II Corps would commence on 20 January with the
U.S. 36th Infantry Division making an assault across the swollen Gari river downstream of Cassino. Simultaneously, the
French Expeditionary Corps (CEF) led by General
Alphonse Juin would continue its "right hook" move towards
Monte Cairo, the hinge to the Gustav and
Hitler defensive lines. In truth, Clark did not believe there was much chance of an early breakthrough, but he felt that the attacks would draw German reserves away from the Rome area in time for the
attack on Anzio (codenamed Operation Shingle) where the
U.S. VI Corps (
British 1st and
U.S. 3rd Infantry Divisions, the
504th Parachute Regimental Combat Team,
U.S. Army Rangers and
British Commandos,
Combat Command 'B' of the
U.S. 1st Armored Division, along with supporting units), under Major General
John P. Lucas, was due to make an amphibious landing on 22 January. It was hoped that the Anzio landing, with the benefit of surprise and a rapid move inland to the
Alban Hills, which command both routes 6 and 7, would so threaten the Gustav defenders' rear and supply lines that it might just unsettle the German commanders and cause them to withdraw from the Gustav Line to positions north of Rome. Whilst this would have been consistent with the German tactics of the previous three months, Allied intelligence had not understood that the strategy of fighting retreat had been for the sole purpose of providing time to prepare the Gustav line where the Germans intended to stand firm. The intelligence assessment of Allied prospects was therefore over-optimistic. from the 3rd FJR "Green Devils" taking part in the battles for Monte Cassino, March 1944 The Fifth Army had only reached the Gustav Line on 15 January, having taken six weeks of heavy fighting to advance the last through the
Bernhardt Line positions, during which time they had sustained 16,000 casualties. They hardly had time to prepare the new assault, let alone take the rest and reorganisation they really needed after three months of
attritional fighting north from Naples. However, because the Allied
Combined Chiefs of Staff would only make
landing craft available until early February, as they were required for
Operation Overlord, the Allied
invasion of Northern France, Operation Shingle had to take place in late January with the coordinated attack on the Gustav Line some three days earlier.
First assault: X Corps on the left, 17 January of the
46th Infantry Division cross the Garigliano river, 19 January 1944 The first assault was made on 17 January. Near the coast, the British X Corps (56th and 5th Divisions) forced a crossing of the Garigliano (followed some two days later by the British 46th Division on their right) causing General
Fridolin von Senger und Etterlin, commander of the
German XIV Panzer Corps, and responsible for the Gustav defences on the south western half of the line, some serious concern as to the ability of the
German 94th Infantry Division to hold the line. Responding to Senger's concerns, Kesselring ordered the
29th and
90th Panzergrenadier Divisions from the Rome area to provide reinforcement. X Corps did not have the extra men, and the battle plan remained unchanged. However, there would certainly have been time to alter the overall battle plan and cancel or modify the central attack by the U.S. II Corps to make men available to force the issue in the south before the German reinforcements were able to get into position. As it happened, Fifth Army HQ failed to appreciate the frailty of the German position and the plan was unchanged. The two divisions from Rome arrived by 21 January and stabilised the German position in the south. In one respect, however, the plan was working in that Kesselring's reserves had been drawn south. The three divisions of Lieutenant General McCreery's X Corps sustained some 4,000 casualties during the period of the first battle.
Main attack: II Corps in the centre, 20 January 's mobility after battle damage inflicted during the fighting The central thrust by the U.S. 36th Division, under Major General
Fred L. Walker, commenced three hours after sunset on 20 January. The lack of time to prepare meant that the approach to the river was still hazardous due to uncleared mines and booby traps, and the highly technical business of an opposed river crossing lacked the necessary planning and rehearsal. Although a battalion of the
143rd Infantry Regiment was able to get across the Gari on the south side of San Angelo and two companies of the
141st Infantry Regiment on the north side, they were isolated for most of the time and at no time was Allied armour able to get across the river, leaving them highly vulnerable to counter-attacking tanks and self-propelled guns of
Generalleutnant Eberhard Rodt's
15th Panzergrenadier Division. The southern group was forced back across the river by mid-morning of 21 January. Keyes pressed Walker to renew the attack immediately. Once again, the two regiments attacked but with no more success against the well dug-in 15th Panzergrenadier Division: the 143rd Infantry Regiment got the equivalent of two battalions across, but, once again, there was no armoured support, and they were devastated when daylight came the next day. The 141st Infantry Regiment also crossed in two battalion strength and, despite the lack of armoured support, managed to advance . However, with the coming of daylight, they too were cut down and by the evening of 22 January, the 141st Infantry Regiment had virtually ceased to exist; only 40 men made it back to the Allied lines.
Rick Atkinson described the intense German resistance: The assault had been a costly failure, with the 36th Division losing 2,100 men killed, wounded and missing in 48 hours. As a result, the army's conduct of this battle became the subject of a
Congressional inquiry after the war.
II Corps try north of Cassino: 24 January fighting near Monte Cassino during the initial assault The next attack was launched on 24 January. The U.S. II Corps, with
34th Infantry Division under Major General
Charles W. Ryder spearheading the attack and French colonial troops on its right flank, launched an assault across the flooded Rapido valley north of Cassino and into the mountains behind with the intention of then wheeling to the left and attacking Monte Cassino from high ground. Whilst the task of crossing the river would be easier in that the Rapido upstream of Cassino was fordable, the flooding made movement on the approaches each side very difficult. In particular, armour could only move on paths laid with steel matting and it took eight days of bloody fighting across the waterlogged ground for 34th Division to push back General
Franek's German 44th Infantry Division to establish a foothold in the mountains.
French Corps halted on the right flank On the right, the Moroccan-French troops made strategical initial progress against the
German 5th Mountain Division, commanded by General
Julius Ringel, gaining positions on the slopes of their key objective, Monte Cifalco. Forward units of the
3rd Algerian Infantry Division had also by-passed Monte Cifalco to capture Monte Belvedere and Colle Abate. General Juin was convinced that Cassino could be bypassed and the German defences unhinged by this northerly route but his request for reserves to maintain the momentum of his advance was refused and the one available reserve regiment (from 36th Division) was sent to reinforce 34th Division. By 31 January the French had ground to a halt with Monte Cifalco, which had a clear view of the French and U.S. flanks and supply lines, still in German hands. The two Moroccan-French divisions sustained 2,500 casualties in their struggles around Colle Belvedere.
II Corps in the mountains north of Cassino It became the task of the U.S. 34th Division (joined temporarily by the
142nd Infantry Regiment of the 36th Division, which had been held in reserve and unused during the Rapido crossing) to fight southward along the linked hilltops towards the intersecting ridge on the south end of which was Monastery Hill. They could then break through down into the Liri valley behind the Gustav Line defences. It was very tough going: the mountains were rocky, strewn with boulders and cut by ravines and gullies. Digging
foxholes on the rocky ground was out of the question and each feature was exposed to fire from surrounding high points. The ravines were no better since the
gorse growing there, far from giving cover, had been sown with mines, booby-traps and hidden barbed wire by the defenders. The Germans had had three months to prepare their defensive positions using dynamite and to stockpile ammunition and stores. There was no natural shelter, and the weather was wet and freezing cold. By early February, American infantry had captured a strategic point near the hamlet of San Onofrio, less than from the abbey and by 7 February a battalion had reached Point 445, a round-topped hill immediately below the monastery and no more than away. An American squad managed a reconnaissance right up against the cliff-like abbey walls, with the monks observing German and American patrols exchanging fire. However, attempts to take Monte Cassino were broken by overwhelming machine gun fire from the slopes below the monastery. Despite their fierce fighting, the 34th Division never managed to take the final redoubts on Hill 593 (known to the Germans as Calvary Mount), held by the 3rd Battalion of the
2nd Parachute Regiment, part of the
1st Parachute Division, the dominating point of the ridge to the monastery.
Aftermath On 11 February, after a final unsuccessful 3-day assault on Monastery Hill and Cassino town, the Americans were withdrawn. U.S. II Corps, after two and a half weeks of battle, was worn out. The performance of the 34th Division in the mountains is considered to rank as one of the finest feats of arms carried out by any soldiers during the war. In return they sustained losses of about 80 per cent in the Infantry battalions, some 2,200 casualties. Kesselring refused the request. At the crucial moment von Senger was able to throw in the
71st Infantry Division whilst leaving the 15th Panzergrenadier Division (whom they had been due to relieve) in place. During the battle, there had been occasions when with more astute use of reserves, promising positions might have been turned into decisive moves. Some historians suggest this failure to capitalise on initial success could be put down to Clark's lack of experience. However, it is more likely that he just had too much to do, being responsible for both the Cassino and Anzio offensives. This view is supported by the inability of Major General
Lucian Truscott, commanding the U.S. 3rd Infantry Division, as related below, to get hold of him for discussions at a vital juncture of the Anzio breakout at the time of the fourth Cassino battle. Whilst General Alexander, C-in-C of the AAI, chose (for perfectly logical co-ordination arguments) to have Cassino and Anzio under a single army commander and splitting the Gustav Line front between the U.S. Fifth Army and the British Eighth Army, now commanded by Lieutenant General
Sir Oliver Leese, Kesselring chose to create a separate
14th Army under General
Eberhard von Mackensen to fight at Anzio whilst leaving the Gustav Line in the sole hands of General
Heinrich von Vietinghoff's
10th Army. The withdrawn American units were replaced by the newly formed New Zealand Corps (
2nd New Zealand and
4th Indian Divisions), commanded by Lieutenant General
Sir Bernard Freyberg, from the Eighth Army on the Adriatic front. == Second battle (Operation Avenger) ==