What's with those logs on tanks?

Pease Park Troll - Where Did the Wood Come From? — Pease Park

First tank action hi-res stock photography and images - Alamy

tankadharvlogs

This Wacky Steam Locomotive-Car Hybrid Paved the Way for Tank Tracks

In the WWII film Fury, the Sherman tanks had logs strapped to the

Slitherine

TRACK-LINK / Forums / Track-Link Build Logs / A34 Comet British

The John Wood Company Buffer Tanks - The John Wood Company

Tank Archives: The Log

Tiger 1 - WW2 Tank Basics