Rule 14 – Third-party practice

(a) When defendant may bring in third party. – At any time after commencement of the action a defendant, as a third-party plaintiff, may cause a summons and complaint to be served upon a person not a party to the action who is or may be liable to him for all or...

Rule 13 – Counterclaim and crossclaim

(a) Compulsory counterclaims. – A pleading shall state as a counterclaim any claim which at the time of serving the pleading the pleader has against any opposing party, if it arises out of the transaction or occurrence that is the subject matter of the opposing...