In 1808, Congress agreed to the expansion of the Regular Army. This led to the establishment of the 5th, 6th and 7th Regular infantry regiments, and a Regiment of Riflemen. The decision was undertaken partly due to British aggression on the high seas. But it was also motivated by fears that the British were offering military support to the American Indians who were offering armed resistance to the expansion along the Northwest American frontier. There was also a powerful motivation for the American government to uphold national honor in the face of what they considered to be British insults (such as the "Chesapeake" affair in 1807).