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Cannonbeemon was capturing Funbeemon to turn them into their foot soldiers. That was when Sora's group happened to pass by.
After a confrontation, both Joe and Gomamon were captured as well. To save Joe, Gomamon, and the Funbeemon, the children took on the Cannonbeemon and succeeded in their rescue!
The rescue would have been far more difficult except in the battle, Birdramon super evolved into the powerful Garudamon.