Me and a few friends have tested countless defence unit compositions and believe that the following seems to be the best line up atm:
1. Before unlocking golden units: Silver archers, Spearman, Chargers, Scropids, spiders and tanks (if its a bit heavy on resource or honour then skip some spearman and the tank from dwarf and have silver archers, scropids and spiders as main focus, use charges to spend those red gems)
2. Late game golden units: 3+ golden archers, 8+ spiders, 4+ scropids, 8+ chargers, and 8+ tanks. Currently at the same level of units, no1 has beaten this defence!
Please let me know if you guys have ideas to share and we can discuss
Also, check out my Recuritment post for Realm 45, Yellow!