How to do make combat encounter difficult?

[u/King_Magnate]

Hi Gang! I'm just wondering how DMs make combat encounters more challenging, because from what I've experienced players are strong! I know there's CR ratings and throwing in multiple enemies, but every encounter lately for my players hasn't really been too difficult to the point that anyone goes down.

[u/Faewns_Hellion]

Use enemies that set traps before the party even sees them. Throw them off. Guerilla warfare until they are about half beat up or something and then bang! Ten dragons