Japanese soldiers will run across the bridge overhead, and you can pick them off if you're quick. When that time comes, return to the three-way crossroad and take the south route. You shouldn't proceed to the next camp until you're assured you've killed the whole crew. If you run further northeast past the mortar, you'll enter a dugout packed with more Type 100s and Trench Guns. They'll drop Type 100s and Arisaka, so stock up. Proceed with caution, as there are a lot of enemies you'll need to deal with. Head northeast first, and you'll find the closest mortar camp. Use the exploding red barrels to your advantage, too. Against them, you should use a normal gun, since your Flamethrower's range is limited. Don't conserve it like a worry-wart, as its protection against the upcoming slew of enemies is invaluable. Following that, run around the corner, lob a Smoke Grenade, and wait for it to activate. First, you can switch your Garand for a BAR that's leaning against the wall to your right (southeast). Armed with a Flamethrower, a M1 Garand, and Smoke Grenades, you'll need to gradually make your way to the Japanese mortar crews.
