guarantee of peace along the road from Zürich to the Gotthard Pass.

The Swiss also had an interest in extending their influence south of the Alps to secure the trade route across the pass to Milan. Beginning in 1331, they initially exerted their influence through peaceful trade agreements, but in the 15th century, their involvement turned military. 1403 the upper Leventina, as the valley south of the pass is called, became a protectorate