What are the slogans on the flags in the watchtower car?

The "watchtower cart" with the watchtower fixed on a high pole is 8 feet high, with a wooden roof on the top, and is 5 feet wide. It contains a person holding a white flag to watch the enemy's movement, and use simple flags to report to the soldiers below. Enemy situation: Roll up the flag to indicate that there are no enemies; open the flag to indicate that the enemy is coming; extend the flagpole flat to indicate that the enemy is close, and vertical the flagpole to indicate that the enemy is approaching; if the enemy retreats, slowly raise the flagpole; if the enemy has retreated, roll up the flag again.