How do you invade a castle with only a few men?
Before any of you get alarmed, this is for a book that I am writing. Obviously, I haven't stormed a castle before, and I was wondering how best to have my character do it. My character is a thief with a force of about 20 magicians, and a ragtag team of about 25 men. He also has one highly skilled archer. The castle they want to take has about 50 semi-skilled men, 25 crossbows, and 10 magicians. What would be the best way for my characters to get into the castle?