File:British Mark IV tank armed with 4 Vikers MGs.png

Summary
The Mark IV (pronounced "Mark Four") was a British tank of World War I. Introduced in 1917, it benefited from significant developments on the first British tank, the intervening designs being small batches used for training. The major improvements were in armour, the re-siting of the fuel tank, and easier transportation. A total of 1,220 were built: 420 "Males", 595 "Females" and 205 Tank Tenders (unarmed vehicles used to carry supplies), which made it the most produced British tank of the War. from https://en.wikipedia.org/wiki/Mark_IV_tank has four ninety degree sponsons armed with Vicker's MGs. Link to photo on Wikipedia: https://commons.wikimedia.org/wiki/File:MarkIVFemaleTankAshfordKent.jpg