At the start of the level, a guard will be ahead running away. There is a box with a flak jacket on your right if you need it. Fallow that guard and take him out when you can. A second enemy will come from your right and a third is located on a roof further ahead. Take them out and keep going. Go towards the next trench and eliminate the enemies as you cross it. Ahead are two enemies wearing flak jackets, taking cover behind a row of barrels. Use the explosion to quickly kill them. Turn ride and climb up to the catwalk. A few enemies will be attack you on the way up.