Skirmish Cancellation is an informal game term referring to either a full-blown deck archetype or a support gambit. Skirmish cancellation is, quite simply, canceling skirmishes, as if they never happened. Skirmish Canceling is a large part of Fellowship block deckbuilding, and has a place in Towers Block. However, Movie Block and later formats rarely use it, with the exception of the Expanded and Standard Pipeweed strategy.
Discarding a character does not cancel a skirmish, rather the remaining character wins the skirmish.