The Thandikulam–Omanthai offensive was a battle for the control of the towns of Thandikulam and Omanthai in Sri Lanka in June 1997.

While the fighting was raging an arms dump was hit by a rocket, causing a huge explosion that resulted in many casualties.

As the Tigers attacked, all of the soldiers deserted their bunkers and left a gap over 1 km (0.62 mi) long in the camp's perimeter.

Within minutes the Tigers had reached the main military base at Omanthai and headed straight for the artillery cannons.

In heavy hand-to-hand combat, the Tigers took Omanthai, capturing six artillery pieces as well as several armoured vehicles.