The operation launched on 13 May 1997, with the 53rd Division spearheading the offensive along with the 21st, 54th, 55th and 56th Divisions. It was preceded by a massive artillery and aerial bombardment, with the SLA breaking out of their fortifications at Vavuniya and Manal Aru and pushing into LTTE-controlled Vanni. The stated objective of the operation was to capture the A9 Highway, running from Vavuniya to the Jaffna peninsula, thereby allowing the establishment of a main supply route (MSR) to the SLA's isolated Jaffna garrison. It was also meant to engage and draw the LTTE out of its secure jungle bases. The Tigers could then be crippled, if not destroyed, by the SLA's superior firepower. The SLA wanted to diminish the strength of the LTTE by the end of the year so that it had to fight only a low-intensity guerrilla war. The operation was very ambitious from the start, requiring large numbers of troops for both offensive operations and the defense of the captured territory. As a result, units of the
Sri Lanka Navy and the
Sri Lanka Air Force were deployed for ground operations in support of the SLA. The LTTE also staged a number of counterattacks against SLA positions throughout the campaign. One was during June 1997, when the Tigers launched attacks on the SLA-held towns of Thandikulam and
Omanthai.
TamilNet claimed that the attacks left 700 SLA soldiers dead and some 1,500 wounded in contrast to only 165 dead rebels. In addition, the SLA garrison at
Mannakulam was also attacked on 4 December 1997; 146 SLA soldiers were killed in the fighting along with an unknown number of LTTE. The operation nevertheless did not manage to accomplish over half of its objectives. By mid-May 1998 it had completely stalled. The LTTE didn't show any resistance initially, but at
Puliyankulam, LTTE troops led by Brig. Theepan showed huge resistance and blocked the Army at
Puliyankulam for more than 4 months. LTTE cadres penetrated SLA lines and sabotaged a major staging area, destroying vast quantities of supplies and killing dozens of troops.
Puliyankulam was meant to be the linking-up point for the twin prongs of the SLA assault. However, the LTTE had built effective defenses at the village and after three months of heavy fighting the SLA had to withdraw after suffering hundreds of casualties and dozens of tanks destroyed. The LTTE cadres at Puliyankulam had irrevocably delayed the SLA's advance and the operation could no longer be completed on time. With stiff resistance in place, the Army bypassed
Puliyankulam and maneuvered through jungles and reached another village called
Kanakarayankulam, hoping to outmaneuver the LTTE cadres, but the LTTE managed to hold off the Army's advance. Unable to break LTTE defense lines, the SLA decided to open the battle on multiple fronts. As the fight continued, defense lines become very long, stretching from
Nay-Aaru all the way to
Mannar. The fighting would continue for several months but the critical A9 highway (between
Mankulam and
Kilinochchi) remained in the LTTE's occupation. In 1998, the SLA moved some of its forces from Kilinochchi towards the south, leaving the entire district vulnerable. In September 1998, the LTTE launched its "Operation Unceasing Waves II", resulting in the
capture of the entire Kilinochchi district. Brutal fighting continued on the A9 highway. LTTE admitted to losing some 1,300 fighters during the course of actions in the first year of the Jayasikurui counter battles. ==Aftermath==