The success and popularity of the M4A3E2 "Jumbo" tanks in combat led to a similar undertaking for the M26 Pershing tank. Conversions started in January 1945 with M26 prototypes modified with heavier armour in the turret and hull into the T26E5. While the heavier weight strained the suspension, the performance was considered favorable. However, the end of World War II led to the necessity of these tanks to disappear, with only 27 T26E5 produced by the war's end for testing.

Introduced in Update "Ground Breaking", the T26E5 is an assault tank that can be most effective at close-ranges alongside the frontlines. Its excellent frontal armor can withstand hits from many armor-piercing rounds, and the fairly good 90 mm gun, inherited from the M26, often destroys enemy tanks with its explosive rounds in a single hit. However, it should be noted that the armor penetration of the main shell might be insufficient against some opponents, and the mobility of the T26E5 does not allow it to be among the first to occupy key positions.