Step by step. On the ridge,

received the task of eliminating the Japanese 3 200mm gun bunkers (to be honest, the attack process I have not seen where the gun), approach the bunkers, press 5 to take out the bombs, press the right button to throw in, and then detonate! After that, along with Sergeant Roebuck all the way forward, first purge the Japanese bunker door, and then kill the inside of the garrison. After clearing the enemy, the mission is complete.