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.