What's with those logs on tanks?

Painting Tanks and Militaria at Fort Leonard Wood - OutdoorPainter

Military Vehicles & Tanks

M60A3 with the wood logs armor ..

Slitherine

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Russian forces get new batch of upgraded tanks

Mark IV tank - Wikipedia

The rhk111 Military and Arms Page: The Wooden Armored Vehicles of

TRACK-LINK / Forums / Track-Link Build Logs / French Heavy Tank ARL-44

What's With the Logs on Soviet Tanks? Koala Explains: Tanks - Tracks and Traction

The John Wood Company Flash and Condensate Tanks - The John Wood Company

Why do some tanks have logs strapped to them? : r/WorldofTanks

5 types of extra armor added to tanks during WWII

Tank Archives: The Log

The Tank Museum - This is a wooden recognition model of a