sentences:  From one of the largest oases in the area, Aouderas was abandoned in 1917–18.A violent 1875 flood destroyed most of the date plantation, and the emergence of the French weakened Kel Owey defences.From the 1880s, Toubu raids increased, and when the Tuareg Kaosen Ag Mohammed rose against the French in 1917, Aouderas was one of the towns he destroyed on his way to the siege of Agadez.