Not a good idea. You've been trying to take Stirling Castle on and off for a while, unsuccessfully. In any case, Edward has superior seige engines and military power. You would undoubtedly fail.
Your advisors are telling you to withdraw. You are grossly out-numbered. They do not want a re-run of the defeat at Falkirk.
You are a skilled military strategist. You have only 8,000 men, so you must employ them very carefully. You are aware that the land around the river Bannockburn is boggy and inhospitable. English mounted knights would experience extreme difficulties in such terrain.
Which card will you play?