Break down a gun carriage, carry the separate parts over inhospitable terrain (or a muddy field), and put the carriage back together again.
Based on events at the seige of Ladysmith in 1899 and still seen at military tattoos.
Can be done at Rough Close camp site, Coventry.
Split beavers/cubs/scouts into team, one group per carriage. Each team has to dismantle the gun carriage, carry the seperate parts