What was the british policy of impressment during the napoleonic wars?

Impressment was the recruitment by force, it was very used by the British to avoid manpower shortage during the war. Since Britain consistently suffered manpower shortages because of low pay and lack of qualification, it was needed to force people into service. The Impressment of foreigners was very common, many times Americans would suffer from it, between 1793 and 1812 more than 15 thousand Americans were impressed by the British.

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.