This battle took place on 16 May 1644 during the Danish-Swedish War near List Deep, between Sylt and Rømø in western Denmark. Nine Danish ships under King Christian IV forced a retreat back into List Deep of 26 smaller Dutch ships (13 under Marten Thijsen and 13 under Hendrik Gerritsen) which had been leased to Sweden. 4 more Dutch ships from Marcus' squadron appeared during the battle but took no part.
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