I went down and fought my way in with two comrades

In a room on the left hand side, I got the documents. On the right, I took the lift down, and along the way many of the enemy came to their deaths.
Soon you reach the room where the first coast guard gun is. Throw a few grenades in and the enemy will be quiet. Go in and plant the explosives to blow up the guns. There was another one on the left and right, so we blew them up one by one. Go down through the doorway next to it and you will reach the ammunition depot. Throw a grenade in to take out the enemy, plant 3 explosives and quickly go back the way you came to the front. After taking out the enemies who came to die, go up to the square of the castle. The four of them were in the jeep, but I had to escape with Major Ingram on his left tricycle. Halfway down the hill we were intercepted by the Germans and we were separated. After that, I had to escape on a motorbike with the Major.