The treaty included a pledge to form a combined fleet to attack Spain.
The truce, which was originally meant to apply to all of the territories of the two empires, was, in practice, limited to the European continent.
The Dutch attempted to restore the trade with the Portuguese colonies by occupying the northeast of Brazil, São Tomé Island, Goree and Elmina, which led to conflicts between the Dutch Empire and the Iberian Union.
John IV sent ambassadors to France, England, and the Dutch Republic, in the hope of forging partnerships with these countries in his fight against Spain.
[2] The treaty was signed on 12 June 1641 in The Hague by representatives of the States-General of the Netherlands and by the ambassador of King John IV of Portugal.