Both armies can travel around the board in either direction. Normally one army means one move. Now, the players have 2 armies which means 2 moves. Each team has the choice to take two moves with one army or take one move using each army. A different piece must be moved during each move.
Pawns only move forward.
Pawns in the light army move to the right. Pawns in the dark army travel to the left. En passant and promoting of pawns applies as in standard rules of chess. Major pieces can move forward or backward. However, the king must stay on his own board segment.