Annexation: add (territory) to one's own territory by appropriation - Oxford.
Appropriate: take (something) for one's own use, typically without the owner's permission

Well first. It doesn't matter that you kept it or not, the fact that you tried to establish a political influence to other states by force is an attempt to annexation. The motive is there, the mindset is there and the military prowess is there. Now let's see several examples of annexation in the history of this continent.

Ryccia and trying to annex Laiwan and imperialism of RATSPT and the Siculites.
Farengeto and the attempt taking of the Kallion islands that was owned by the Zarisan govt.
The Kingdom of Karnetia annexed Corisian Kingdom in the 1000's.
The conflict between Sovonor and Tolsen when Emperor Wiktor VII annexed Tolsen and renamed it the Province of Kringalia
Ryccia and the Timorah islands (Actually, every nation and the Timorah Islands)

Well, as for you Henn. Since you didn't develop your history that much, I figure the only thing I could find for imperialism is Aquica. I am not sure wether this colony of yours is acquired from establishing a Sporaltryan civilization in the uninhabited island, or taken by force. But annexation of a piece of land, nonetheless.

Sorry for being quite the arse in the past post. But over the days in the website, it is clearly evident that some people would want to annex smaller territories with force. As with RL history. Take Ryccia for example, his state is like the United Kingdom, it has many territories across the region and farther as well. I see Laiwan as his India and Kys as his Singapore. That is why we all made our nations so strong and mighty, no one wishes to be pushed over, no one wishes to be annexed either. There are absolutely no third world countries in our region and no country that could be annexed like in the gunpowder age. (Well excluding Imkitopia, however but I don't know what you would call that nation).