Panzer II
While the Panzer I proved the spearhead of these initial invasion assaults, the Panzer II formed the backbone of such early forays. The plan was to produce a better-armed and armored version of a light tank to shore up the limitations of the Panzer I as well as provide priceless training to tank crews. Underpowered, under-armored and lightly armed, the Panzer II experienced its hardships particularly against anti-tank weaponry at close ranges. Nevertheless, war was on the horizon so time was of the essence and the more lethal Panzer IIIs and Panzer IVs were being developed and soon be mass-produced for the coming battles.