On the left flank they are supposed to keep the french on the other side of the river Grosse Laaber, but they fail to protect a crossing, and soon they have to fall back as three regiments, eight battalions of french troops cross. Together with IR38 they fall back into some woods on the north-east side of Eggmühl and there holding the line, while the rest of the Austrian army begin falling back to avoid a fight they can't win. IR20 did a sterling job of holding of superior numbers and prevented the army from losing it's way of retreat, and only after a long days fighting did they fall back and leave the french in possession of the field.
It was a hard fight but it did hold the Austrian army together as a fighting force, and while beten, it was far from destroyed.
Here we have the regiment so far, only one unit away from totally complete.