Thus, these brigades could field two Panzer and two Panzergrenadier battalions.[7] According to Eddy Bayer[9], there was one <<Tiger>> batalion(50 units), one <<Panzer Mark IV>> batalion(30 units), two panzergrenadier battalions on half-armoured trucks and one assault guns regiment(27 self-propelled guns). Aside from the Panzer Brigades above, there were also ad-hoc units that were known as Panzer Brigades; there was a Panzer Brigade that was actually a commando unit (Panzer Brigade 150).[8]