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Dehau organized the festivities marking the seventh centenary of the Battle of Bouvines in 1914, rebuilding the parish church and commissioning stained-glass windows depicting the battle.
It has been suggested that, after the resounding defeat of Otto and his English ally John at the Battle of Bouvines (1214), Gervase was forced to retire to the duchy of Braunschweig, where he became, and died, provost of Ebstorf, and it is apparent that his work was known to the authors of the Ebstorf world map (ca. 1234–40).
After Philip's murder in 1208, he "said and sang" in support of Otto of Brunswick against the papal candidate Frederick of Hohenstaufen; and only when Otto's usefulness to Germany had been shattered by the Battle of Bouvines (1214) did he turn to the rising star of Frederick, now the sole representative of German majesty against pope and princes.