[1] During these travels he joined the Dutch East India Company and was once in the service of the States-General of the Netherlands, in which reached the rank of lieutenant.
[1] His most important missions were to convoy transport ships, undertake cruises, and protect the Bohuslän coast against Danish attacks.
[1] In 1716, Strömstierna was missioned to convoy a number of transport vessels, loaded with siege artillery and supplies, to Svinesund.
[1] During Strömstierna's subsequent period as commander of the Gothenburg Squadron, he contributed significantly to the repelling of Tordenskjold's attack on the city in 1717.
[1] That year he became head of Roddargastarnas Regiment (3,000 men), and in 1718 he led the shipment of over a hundred ships loaded with food and other supplies from Gothenburg to Strömstad, which made the military campaign against Norway possible.