Kammala jumla mai zuwa: A shekara ta 1639, a lokacin gwagwarmayar Holland don 'yancin kai daga Spain, Tromp ya ci nasara a kan babban jirgin ruwa na Mutanen Espanya da ke zuwa Flanders a
Yaƙin Downs, yana nuna ƙarshen ƙarfin jirgin ruwan Mutanen Espanya. A cikin yakin farko, aikin 18 ga Satumba 1639, Tromp shine kwamandan jirgi na farko da aka sani don yin amfani da dabarun yaƙi. Babban jirginsa a wannan lokacin shine "Aemilia".