Sometimes you need to go fast to get to something, for example a treasure. One way is to use reinforcement on a HQ or a city. But it will only work in your own alliace territory. I will explain how it works and how you do this.

 You find a team member or city close to were you are going (even if the HQ/city only gets you halfway to your target you reinforce). The reinforcement trick only works on your alliance territory, so check closely that the ciry or HQ is apart of your team and are in alliance land.

When you find the closest HQ or city, click on it and choose reinforce.

Here you can see the difference in traveltime if you renforce a city/hq or just drive to the spot.

As you see on the map im at the hive with all the blue dots and the city is far up in the north. So reinforcement will get you to your target really faster.