Definition of "campaigning"

He has had crosses and losses; terrible campaignings against the Turk, in old times; and always such a stock of quarrels, at home, as must have been still worse to bear.

1858, Thomas Carlyle, “Journey Homewards from the Reich; Catastrophe on Journey Homewards”, in History of Friedrich II. of Prussia, Called Frederick the Great, volume II, London: Chapman and Hall, […], book VII, page 238

And even though their numbers have been halved—that’s the unofficial tally given in one of the strategy sessions—everyone from Sansa to Daenerys to Varys is wondering who is going to rule over which pile of smoking ruins. That’s when the campaigning begins, much to Jon and Dany’s chagrin.

2019 May 5, Danette Chavez, “Campaigns are Waged On and Off the Game Of Thrones Battlefield (Newbies)”, in The A.V. Club‎, archived from the original on 28 January 2021