Quite rare to go through a DD session without a single fight.
However, I remember one time quite well still. I have been DMming a campaign for 2,5 years now for the same group. They are now around 22nd level, but at that time, they were somewhere around 15 or so.
The adventure was the section of Rod of Seven Parts -box, where they must go to Cloud giant fortress during a cloud and fire giant wedding and search for one of the pieces of the rod. That means there was like 40 giants in the castle at least.
Well, the group consists of not one, but TWO dwarves. For all the time before that adventure, they were asking if they can kill giants. In fact, I had not put a single giant against them before that.
Well, the adventure took 3 play sessions and they did not hurt a single one of the cloud or fire giants in the castle. In fact, in the end the Bard got the part by bluffing himself to be a paid hairdresser/barber for the fiancee
.
The whole group wondered about how they got through that without violence. The giants just did not find enough reason from the players to become aggressive, and the players were not the I-kill-everything-type and did not just go rampaging through everything. The bard and diplomacy/perform/bluff/gather information was well used in that adventure, though.