Four policemen land hospital clash students

It seems like you're trying to describe a situation where four policemen clashed with students at a hospital. Here's a possible rephrased version:

"A violent confrontation occurred at a hospital when four police officers clashed with a group of students. The incident resulted in a physical altercation, with both sides involved in a heated and intense struggle."

Please let me know if this accurately captures the essence of the situation you're trying to describe, or if you'd like me to rephrase it further!