British Challenger 2s are being transported from the NATO Forward Holding Base in Sennelager, Germany, to Poland for training.
Delivering the tanks is a task for a UK Theatre Enabling Group and includes a road move of 1,200km via the port of Gdansk to the eventual destination of the Polish training ground of the King's Royal Hussars Battlegroup.
One thousand British troops are participating in the US-led Defender Europe exercise in the country.
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Seventy-two of the main battle tanks and 8,000 UK troops will be operating from Finland to North Macedonia as part of exercises across eastern Europe to combat Russian aggression, described as one of the Army's largest deployments since the Cold War.