Of Bertran's poetic works are conserved only two coblas written in response to Gui de Cavalhon.
Raymond VII had moved an army against Castelnou d'Arry early in 1220 but was forced to lift his siege to deal with an offensive of Amaury de Montfort.
In the third month of the siege, October–November, Gui decided to request the assistance of Bertran in a poem, with the intention of hurrying the town's surrender.
Gui evidently knew Bertran from some previous encounter and they address each other with friendly satire.
This entire story is found in Gui's vida, with the exchange of coblas appended to it in manuscript H.[1] According to Alfred Jeanroy, Raimon de las Salas composed a partimen with Bertran, who proposed the dilemma: who are better at making war, feasts, and gifts, the Lombards or Provençals?