Just note that Indiamen and their likes (not the eastern ones though) were extraordinarily large merchantmen. Many were no bigger than Sloops and Brigs, and Frigate-size would generally be a pretty decently sized ship.
How can I know? Well, the number of ships involved. Ships the size of Indiamen were investments on the scale of early 20th century atlantic liners. They were not common due to costs for the 'common' company. The Indian Companies obviously had the currency to get them made.
As a little pointer in the Gunboat War Denmark persecuted against the UK in the Napoleonic Wars she relied very heavily on gunboats (duh) and privateers. The greatest success came when an entire convoy of more than 100 ships were captured, by tiny little privateering ships with a handful of guns (and mind you not even military personel so pretty crappy in a fight). If even just 5-6 ships had been Indiamen or that size there wouldn't have been an incident at all... The convoy would have passed through safely, perhaps the odd ship captured.
Indiamen should easily carry 2 units.
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