This is a Tunnels and Trolls adventure in the Castle Calahony series.
The first day brings no problems and a speedy advance, but the second day you encounter three companies of reinforcements marching to the Barons army. Allthough you make up a very credible story about a message to be delivered to Earl Erlang, the three centurions don't believe a word of it.
You are chained, brought back to the camp, and sentenced to three days imprisonment. All your money is forfeited.
You are released just in time for the next battle.