Dig underground tunnels for training. If soldiers learn to deflect blows even there, no one will be able to penetrate their defenses in the cramped corridors of the Castles. This Study will increase your army's defense stats in Castles.
| Level | Drafts | Time | Army Defense in Castles | Power |
| 1 | 2 500 | 29w 12h 00m 00s | 5 | 9M |
| 2 | 3 350 | 31w 4d 12h 00m 00s | 15 | 9.1M |
| 3 | 4 450 | 35w 3d 12h 00m 00s | 25 | 9.2M |
| 4 | 6 050 | 41w 12h 00m 00s | 35 | 9.3M |
| 5 | 8 250 | 49w 1d 00h 00m 00s | 45 | 9.4M |
| 6 | 11 500 | 60w 4d 12h 00m 00s> 1 Year(s) | 55 | 9.45M |
| 7 | 16 000 | 77w 2d 00h 00m 00s> 1 Year(s) | 65 | 9.55M |
| 8 | 22 500 | 101w 4d 12h 00m 00s> 1 Year(s) | 75 | 9.65M |
| 9 | 32 000 | 138w 00h 00m 00s> 2 Year(s) | 85 | 9.75M |
| 10 | 45 500 | 193w 3d 00h 00m 00s> 3 Year(s) | 100 | 9.85M |
| 152.1K | 757w 3d 00h 00m 00s> 14 Year(s) | 100 | 94.25M |
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