DeadPoolZ - if you note the comments in the OP, for attacking a lvl 5 NPC with NO losses, you MUST have a MINIMUM of archery 8, HBR 5.

"Confirmed Archery and HBR combinations when raiding a lvl 5 npc city"

Archery 07 / HBR 07 (Massive losses due to being in tower range, confirmed by Countryrazorback)
Archery 08 / HBR 04 (Smalls losses from units but @ tower safe range, confirmed by thetho21)
Archery 08 / HBR 05 (0 Losses confirmed by me, shoko-koko, Cudaman73)

Until your archery reaches 8 and HBR 5, I suggest you stick with NPCs lvl 4 and under.