sentences:  The change in British attitude towards the Assyrians gave rise to the notion of the "British betrayal" among some Assyrian circles.An idea which first gained popularity after 1918, when the Assyrians who were concentrated in Urmia did not receive the British relief which led to their massacre by the Turks and Kurds and their deportation to Hamadan.7 August officially became known as "Martyrs Day" or "National Day of Mourning" by the Assyrian community in memory for the Simele massacre, as it was declared so by the Assyrian Universal Alliance in 1970.