Hanuman was just one of such 4 monkeys. This monkey group was instrumental in providing Rama essential information about Sita. They aided him create a bridge through the seas, and cross about by using a monkey army that properly stormed the demon stronghold and freed Sita. भस्मसादभवदैत्यो दुष्टचेष्टितमन्तकृत् ॥ २३ https://archertmdtk.onzeblog.com/37556338/everything-about-krishna