Having defeated the navy in the Manhattan Rebellion, the army-led Coup Group turned its attentions toward the remaining civilians in government. Although the military was in control of the army, politicians and legislators continued to annoy the generals. Throughout 1950 and the following year, the civilians and military men bickered over spoils and offices, and, despite its monopoly on the use of force, the Coup Group lost some political battles. In January 1951 the civilian parties forced the prime minister, Field Marshal Plaek Phibunsongkhram (Phibun), to replace two military ministers with civilians. Similarly the Senate remained a royalist stronghold. In one October session senators sharply attacked the government for its violent suppression of the Manhattan Rebellion. In November the upper house blocked a bill to increase the military voice in elections.