Hanuman was one of those 4 monkeys. This monkey group was instrumental in giving Rama vital information regarding Sita. They served him establish a bridge across the seas, and cross above which has a monkey Military that successfully stormed the demon stronghold and freed Sita. भस्मसादभवदैत्यो दुष्टचेष्टितमन्तकृत् ॥ २३ ॥ https://www.youtube.com/@Mahavidyabaglamukhi/