|Map Type||Control Point|
- "How did the manly men of Team Fortress appear at a tenth century battlement? Simple. The Soldier angered a magician."
- ―Medieval Mode Publicity Blurb
DeGroot Keep is a Medieval mode map that was released with the Australian Christmas update on December 17, 2010 Patch. It is currently the only official map designed for this game mode. Health pickups inside the keep appear as medieval-style roast meat.
The map is a relatively small capture and defend stage. At the beginning of the round, BLU must capture the town (Point A) and cliffside (Point B) located at ground level to the sides of the castle. Because the castle gate is initially closed and impassable, RED must mount a defense from the top of the castle. Defenders can fire projectiles from above or leap off the walls to engage BLU directly.
Once the first two points have been captured, the castle gate will rise and allow access to RED's keep (Point C) located at the end of the castle courtyard. BLU will then have a certain amount of time (60 seconds by default) to capture Point C, indicated by an on-screen timer. The gate will only close once the timer expires and Point C is clear of any capture progress. Once the gate closes, Points A and B will need to be recaptured before another attempt can be made on Point C.
Players can shoot projectiles through the grills of the castle gate or arrow slits in the towers. Braziers and torches located near the team bases can be used to set the Huntsman's arrows on fire for additional damage.
Medieval Mode is (supposedly) set in a 10th Century manor, but there are several hints scattered throughout the map that suggest that the team is merely in some kind of medieval simulation.