The attack began on 8 August, after a violent four-hour artillery barrage. The fortified Pravila peak, held by the Romanian 27th Dorobanṭi Regiment "Bacău", was assaulted four times by the Austro-Hungarian 70th Infantry Division, without result. The German
117th Infantry division was more successful advancing around Ungureanu peak and inflicting heavy losses on the 16th Dorobanṭi Regiment "Baia". To the south, the 10th Dorobanṭi Regiment "Putna" managed to hold its ground. During the night, the Romanian 4th Corps counterattacked in the German-held areas, taking 200 prisoners and retaking some lost ground. The following afternoon, however, the Central Powers attacked in force, taking Pravila peak and advancing near . The Romanian 7th Infantry Division retreated to a new defensive line. Violent fighting continued on 10 August, exhausting the Romanians, who could not reinforce their lines properly due to the concurrent fighting at
Mărășești. Only the 1st Cavalry Division arrived on 11 August, immediately entering combat and recapturing the area south of Coșna Hill and Stibor Hill in the evening. German units which occupied the village of Oituz were pushed back by the mountain troops and
armored cars of the 2nd Corps. On 12 August the newly-arrived
Vânători de munte (Mountain troops) Battalion, after a march and a 20-minute rest, attacked
Cireșoaia peak, in tandem with the 27th Regiment, one other Romanian and two Russian battalions. The mountain troops broke through the 70th Infantry Division's defenses, taking 417 prisoners, while suffering only 21 casualties. The Austro-Hungarian division suffered nearly 1,500 casualties in total at Cireșoaia. On 13 August another Romanian reinforcement, the
Grăniceri (Border Guards) Brigade, attacked Central Powers positions south of the Oituz river, losing more than 800 men while gaining little ground. The 1st Cavalry Division retook Coșna Hill and held it against German counterattacks. At Cireșoaia, the 7th Infantry Division attacked together with the Russian 2nd Infantry Division; after initial gains, the Russian 195th Infantry Regiment was repelled, and Austro-Hungarian troops threatened the Romanians' flanks. Subsequently, the advance was halted.
Erwin Rommel later described the August 1917 fighting in the Oituz Valley from the German perspective. His detailed account in the 1937 book
Infantry Attacks recalls his experiences as a junior officer leading an ad hoc multi-company grouping of German mountain troops near Coșna Hill. ==References==