What was the name of the cancelled sequel of Team Fortress?

The cancelled sequel of Team Fortress was called Team Fortress 2: Brotherhood of Arms. The game was initially planned to be a more realistic and military-focused version of the original Team Fortress, featuring different character classes and gameplay mechanics. However, due to development issues and the positive reception of the original game, the sequel was ultimately cancelled and reimagined as Team Fortress 2, which took a more comedic and stylized approach to the gameplay and character design.