 The first treaty uniting the eight members of the confederacy was the "Sempacherbrief" of 1393, concluded after victories over the Habsburgs at Sempach in 1386 and Näfels in 1388, which forbade a member from unilaterally beginning a war without the consent of the other cantons.A federal diet, the "Tagsatzung", developed during the 15th century.Pacts and renewals (or modernizations) of earlier alliances reinforced the confederacy.