We have all seen movies where a handful of soldiers disguise themselves, and I read that during ww2 a group of german panzer tanks were disguised as usa wolverines (or hellcats?) but were captured. What was the largest group to disguise themselves as the enemy successfully?
The use of false flags has traditionally been a large part of naval warfare; a vast number of ships have been captured because they stopped to hail a pirate or enemy flying their nation's flag. In World War II, Germany launched several commerce raider ships which carried false funnels and other bits of fake infrastructure to disguise their ships.
Ah. You're thinking of Operation Greif where they had disguised panther tanks to look like M10 Wolverines along with commandos to breech the allied lines and capture strategic points.
It did not work as intended as there was a huge shortage of equipment and allied supplies