In Lords Mobile Siege Attack research increases the attack stats of all your siege troops. It is found in the military tree.
There are 10 research levels and once maxed your will have increased your siege attack stats by 135%. This research is needed to unlock tiers 2 to 4 siege units.
The table below has the resource cost and time to upgrade each level. It also shows the might and rewards granted. You can find out your own individual times based on your research boost here.
Siege Attack Research Requirements
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