What's with those logs on tanks?

Why do many older Soviet tanks carry logs around, on the back? - Quora

In the WWII film Fury, the Sherman tanks had logs strapped to the sides of the tanks. What purpose would they have served? - Quora

Gas Powered Fahrschulwanne Tanks - Tank Encyclopedia

Tiger 1 - WW2 Tank Basics

Tfwadmx Aquarium Driftwood,3 Pcs Spider Wood Sinkable

TRACK-LINK / Forums / Track-Link Build Logs / Andy's HHQ Tiger 1

Churchill Avre log carpet - MLU FORUM

Military Vehicles & Tanks

Simulating Log PT with the Sandbaby Murph

Think Tank - The heat is on! Holzgasantrieb