Tobias is noted for his valour during the Dutch Attack up the Thames River estuary Raid on the Medway in June 1667.
During the battle he was aboard Lieutenant-Admiral Baron Willem Joseph van Ghent's frigate Agatha and charged with the reduction of the intentionally sunken English warships as an obstacle preventing the Dutch from continuing upriver.
(3) Tobias is last mentioned in 1673/4 as the captain of the 58-gun Dutch frigate Geloof during Admiral DeRuyter's second punitive expedition to the Caribbean and his attack on French Martinique.
The Dutch historian Dr. Japp R. Bruijn also mentions that Thomas Tobias and Michel DeRuyter were close neighbors and friends.
Bruijn estimates that eight percent of seamen serving in the Dutch Navy during the 17th century Anglo-Dutch wars were from the British Isles with a majority of those from Ireland.