Jamestown

Despite Spain and Britain being at war, once Spanish colonists discovered the British settlement, instead of engaging in conflict, they focused on eradicating the Natives and expanding their territories and influence.

An excerpt from the article 32 facts about Jamestown
There have been cases of planting Spanish spies among the residents of Jamestown, and there is historical evidence of the British executing at least one of them—the councilman Captain George Kendall, whose execution was carried out in 1609.