Raise the Flag

Day two of Spy Camp in Forest School and the weather had really changed. Overnight rain had completely changed the site from the dry sunny place it had been the last few days. Slightly changed how the day ran as the wetness meant some activities couldn't be done. Still great fun and God decided to have a little bit of a laugh in the afternoon session too.
So how do you raise a flag with two sticks and a few pieces of string?