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I post here a relevant thread found elsewhere, also unclear which part of the mission you mean. So from the beginning....
Go up and toss some smoke around the corner of the
trench and move up. There will be enemies in front of you, to the east, so toss frags or burn them and move up. Head into the bunker and burn them through the screen. Inside is a Trench Gun (aka a shotgun).
Come back to the first crossroad and go up the southern path as enemies will be around ever corner and up above you, so stay low and be ready for enemies anywhere, even in the trees. Use your flame-thrower or shotgun, either one, and don't be afraid to toss frags ahead of you. When you hit the second bunker, same deal as before, only these four enemies will try to rush you.
Then go outside and up with your M2 start burning everything in the pit, then jump in and burn the guys down a fenced tunnel to the right. There are snipers in both trees, so burn them. Toss smoke at the corner of the trench and then go and burn the third tree sniper, then melt the sandbag area to take out the guys on the side as you watch for rushers.
Move up the trench, big group to burn at the corner, a bunker to burn on the right side, and then pick up the Type99 in the bunker, unless you really like that short-ranged shotgun. Go out and toss smoke down the trench into the open area, then run up and burn the sides, then anyone not an ally. There there are two bunkers. Enter the one on the left with your flame shooting because the
guys will rush you. There is Type99 ammo inside.
Pull your your other gun and enter the right tunnel as enemies will be in the open part of it. Toss frags around the corner as there is a wicked nest of Tojo, so cook your frags too, then run up and just spew fire from side to side. Go out into the mortar pit with flame's a firin' as this is the last one.