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The Chola Navy had a sophisticated organisation structure, with multiple levels and battle group sizes depending on the operational requirements, akin to modern day Naval fleet organisation. This organisation became necessary after the conquest of Ceylon. The navy was organised into role-based squadrons and divisions, containing various ship types assigned for specific roles and home-ported at associated ports. A Ganam was typically the largest operational unit, consisting of between 100 and 150 ships of various types, and included a strong marine infantry presence.