We started an Assault in a multiplayer game with 2 players. In the first round everything was fine but at the beginning of the second round the looters were nowhere to be found. We heard the battle horn and their voices but they were not physically there. They couldn't fall anywhere because before we started we covered all the holes. We had to change the difficulty to Peaceful and then to Normal in order to continue with the game even though we have lost the opportunity for an assault. We also closed the game and opened it several times and even restarted the computer but it did not solve it. We are waiting to find another patrol to see if the same thing happens again.