Infantry taking on tanks is a real challenge. Infantrymen are, afterall, mainly equipped with weapons primarily intended for killing enemy infantry. Anti-tank guns are large, cumbersome, and heavy and so, right from the first days of the tank in WWI, the goal has been to produce a man-portable anti-tank weapon. One of the first, the Mauser Panzergewehr M1918 was little more than a scaled up rifle designed to defeat relatively modest armor. More anti-tank rifles followed in the decades afterwards up to the first years of WW2, but they all suffered from the same drawbacks. The rifles were so large and heavy they would take at least one (often two) men to carry without being able to carry the usual accoutrements of infantry work. On top of this, the performance was relatively modest. Only thinly armored vehicles were vulnerable and anything with armor about 30 mm thick was relatively impervious to them.  

Article: https://tanks-encyclopedia.com/sticky-and-magnetic-anti-tank-weapons   

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