This document provides a historical analysis of a 1925 British diplomatic dispatch regarding the military occupation of Arabistan by Persian forces. It details how British officials observed the systematic erosion of Sheikh Khazal’s authority as the central government in Tehran consolidated power. Despite recognizing the negative impact on the Sheikh’s semi-autonomous rule, the records reveal a deliberate British policy of non-intervention and passive observation. The text argues that this archival evidence proves the fall of the Emirate of Mohammerah was an act of military conquest rather than a simple administrative change. Ultimately, the source highlights the broken promises of the Persian Prime Minister and the strategic abandonment of a former British ally during a pivotal geopolitical shift.