Over the course of the late Republic, formerly authoritative institutions lost their credibility and authority. For example, the Sullan reforms to the Senate strongly split the aristocratic class between those who stayed in the city and those who rose to high office abroad, further increasing class divides between Romans, even at the highest levels. Furthermore, the dominance of the military in the late Republic, along with stronger ties between a general and his troops, caused by their longer terms of service together and the troops' reliance on that general to provide for their retirements, along with an obstructionist central government, made a huge number of malcontent soldiers willing to take up arms against the state. Adding in the institutionalisation of violence as a means to obstruct or force political change (eg the deaths of the Gracchi and Sulla's dictatorship, respectively), the Republic was caught in an ever more violent and anarchic struggle between the Senate, assemblies at Rome, and the promagistrates.