First War of the Guelderian Succession

• The Heeckerens supported Machteld of Guelders, and were led by Frederik van Heeckeren van der Eze.
• The Bronckhorsters supported William of Guelders, and were led by Gijsbert V van Bronckhorst.

Timeline

• 1372 The Bronckhorst faction carries out raids in the Sticht Utrecht, presumably because the bishop of Utrecht Arnold II of Horne had joined their enemies. In the Battle near Heerewaarden, the Bronckhorst faction is defeated.
• 1372, Gozewijn van Varik, cousin of Machteld of Guelders, conquers Tiell in the spring of this year. Throughout the year, struggles continue within the city.
• 1372/73, troops of Arnold II of Horne conquer Harderwijk on behalf of Machteld of Guelders.
• 1373, John II, Count of Blois begins his Siege of Venlo.
• 1374, Reinoud I van Brederode conquer Tiel on behalf of Machteld of Guelders.
• 1376, the leaders of the Bronckhorst faction are ambushed and taken as prisoners near Oosterbeek.
• 1377, Charles IV gives the Dukedom of Guelders to the son of Mary and William III.
• 1378, Battle of Tiel.
• 1378, In the Battle near Gennep the Heeckeren and Bronckhorst factions confront each other.
• 1379, The village of Zennuwijnen with its church and abbey are destroyed by the Bronckhorst faction.
• 1379, On March 24 the last battle was fought near Hönnepel. Machteld of Guelders was defeated by the troops of Julich and resigned from her rights to the dukedom of Guelders.