Widelands is a real-time strategy game like Warcraft and if you are familiar with Settlers I & II™ (© Bluebyte), then you already have a rough idea what Widelands is all about because widelands is heavily inspired by those two games. The goal of the game is build an empire by harvesting resources & getting more soldiers.

However, this is a strategic game, not a tactic one, and the emphasis is not actually on war but on building your economy. Similar to Simcity you will build up roads, but then use those roads for war.