I would use a combo of mustard gas grenades to get the enemy out (mustard gas is VERY lethal), mortars to destroy any bunkers or ammo storage, and gorilla tactics and snipers to take out the enemy.
Explanation:
I do a lot of WW1 and WW2 planning of how I would do battles-
By 1279, the Mongol Empire covered over 33,000,000 km² (12,741,000 sq mi), up to 22% of Earth's total land area. It held sway over a population of over 100 million people.
