By the summer of 1758, the French position in North America was growing increasingly tenuous. The flow of food and other supplies was drying up due to the British naval blockade of North America. There were simply too many British soldiers and not enough French to fight off the various British attacks. Meanwhile, the ambitious British campaign of 1758 continued with a bold strike on the key French supply hub of Fort Frontenac and with a slow but sure attack on that old thorn in the British side, Fort Duquesne.