In France, go into the broken house across the street from the barn and go inside the room closest to the street on the second floor. Climb the side of the house that looks like steps to reach an attic where you can look through the walls. This is a great area to snipe from.
On the"Eder Dam" map, select support (recommended) and go to the base on the right side of the bridge (when looking at it from the two story house). Once there, go to the motorcycle on the left side of the base and enter it, but don't turn the handlebars at all. Simply hold B until you are all the way backed up. Exit and you will be under the hill. Stay on the grass and do not go too far back or forward or you will fall off. You can lay down and are able to shoot through the hill.
When you meet up with the French rebels you'll have the choice of going left to the Flak 88s or going through the house to the right. Go left to the guns and kill all the Nazis around the gun and in the ditch leading to the next gun. Then, blow up the 88 and move on to the rest of the guns. After you blow up all the guns you will reach the house that you would have had to go through if had chosen right. When you go in the house you must defeat a Nazi that is there waiting for you. Kill all the enemies in the house and fall through the burning floor. You will find your allies there waiting for you.
On the second mission, "The Island", there is a man under the second bridge with a FG42 scoped. That gun gets you more ammunition every time you kill someone. The gun starts with 96 ammo remaining and you can kill about 150 people with it (not including melee). After completing that mission you will have that gun on the third mission, but you must save the gun through the third mission to get it in the fourth mission and so on.
On the "Eder Dam" map, go to the base on the right side of the bridge (when looking at it from the two story house). Once there, go to the motorcycle on the left side of the base and drive it to the right side of the base, then park parallel to the wall. Exit and you will be on the other side of the wall. You can now shoot through the wall (not the building) Note: The other team can shoot through the wall also.
During any mission, when you kill a German soldier, look at his helmet. You will see the new German flag (black, yellow and red), which did not exist during World War II. During that time period,Germany used a red flag with the swastika on it.
As the British you will have to clear out a building. When you clear it out, go up to the upstairs area and move to your right. You will find a little room. When you get to the entrance, look to the left to find three KAR98Ks and three MP40s. You can pick those up whenever desired, and they respawn. Collect them if you are low on ammunition, then return there again when you need to restock.
In Chapter 1 (Saint Lo), capture the church by killing all of the Nazi soldiers (while hiding behind walls etc.). It is recommended that you use the Thompson gun in your arsenal. Once all the Nazis in sight are dead, go up to the church and throw two or three smoke bombs in it. After that, throw two grenades into the church while the smoke is still active. Once done, you will be able to go to your destination, capture the church, and be able to move on.
When sniping, get into a nook, cranny, or other some small place where you can either crouch or go prone. Make sure you have a good view on your targets. Tall grass is also a great idea, as well as areas where people will not realize you are there (for example, camping on the enemy's spawn point). When sniping on a very tricky target, or if you do not want to be seen, try to pull out your pistol and use your binoculars to spot your target. Your position is much less obvious if you use your binoculars. Although many people will debate this, do not take any more shots than you need to. If possible, take them out in one shot. Do not shoot unless you are sure that you will kill your target without their friends detecting your position.
If you like a particular weapon from your faction, such as the M1 Garand or Bren, use the following trick to get more ammunition. Find a character on your team that isn't unkillable, such as Sgt. Dixon, or Lt. Robiechaud, and melee them. More often than not, the game will not fail the mission, allowing you to pick up the ammunition and continue the fight.