Adams commanded a resupply ship during the Spanish Armada campaign. Supply vessels sometimes added their guns to the running battle before returning to logistical work, so he probably fired on the enemy. That remains an inference about his own actions. Campaign service also put him in contact with Drake, Raleigh and Effingham. Knowing those captains could help his merchant career, but claims that he was Drake's best friend overstate the connection.
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Armada supply service and professional connections
Supply-ship command could bring combat experience and contacts with senior English captains.