Marching Speed-up boosters makes your troop reach their goal faster.
There are 5 types: The first three must be started before you start the march(es). If the booster expires after your march have started, it will still maintain the higher speed until it reaches the next point in the march (a target or returning home, whatever comes first)
The last two are used to speed-up a march that is in progress, and your troops are instantly moved so much closer to the target as the speedup defines. You can use several sequentially, thus make it possible to hit a target i practically no time. Example; if you start a 16 minute march and thereafter activate 4 Marching speed 50%, each activation will cut the remaining time in half, thus giving you a final time left to target of just 1 minute (each activation will lower time left to 8min then 4min then 2min and the fourth will lower it to 1 min). You can apply even more, as long as you have them
Note that you can NOT COMBINE different boosters. If you activate a different speedup, the previous will be cancelled. You can combine boosters with one from each group.
Applies to all troops (including scouts) either attacking town or resource spots. I'm not sure if it applies to Hero during attack on invaders (please verify)
1-Hour Marching Speed-up of 50%
This makes all marches you start while this booster is active to reach their goal 50% faster.
30 minute Marching Speed-up of 100%
This makes all marches you start while this booster is active to reach their goal 100% faster (half the normal time).
15-minute Marching Speed-up of 200%
This makes all marches you start while this booster is active to reach their goal 200% faster.
Marching Speed-up of 25%
This makes troops on a march in progress to instantly jump a quarter of the remaining way closer to the next target.
Marching Speed-up of 50%
This makes troops on a march in progress to instantly jump half the remaining way closer to the next target.
Related topics: Marches (maximum headcount in a march).