Grow Empire: Rome Unit Branch Guide: Best Upgrades for Defense and Invasions

To optimize unit branches in Grow Empire: Rome, choose defensive survivability for castle wave defense and offensive armor penetration for territorial invasions. Prioritize leveling Roman Spearmen and Swordsmen along high-health defensive paths first, as keeping enemies stalled beneath your wall defenses provides the highest return on gold during early and mid-game wave progression.

Unit Branch Comparison and Combat Roles

Troop Class	Branch Path	Primary Combat Strength	Best Game Mode	Strategic Trade-Off
Spearmen	Fortified Shield Wall	High HP and block chance	Wave Defense	Low offensive clearing speed
Spearmen	Anti-Cavalry Shock	High damage vs. cavalry and beasts	Map Invasions	Lower durability against archers
Swordsmen	Armored Legionary	High armor and crowd-control resistance	Wave Defense	Reduced burst damage output
Swordsmen	Heavy Shock Melee	Rapid attacks and armor penetration	Colony Sieges	High vulnerability to enemy arrows
Archers	Rapid Sagittarii	Fast fire rate and swarm suppression	Horde Defense	Ineffective against heavy armor
Archers	Piercing Crossbow	Armor-piercing burst damage	Armored Invasions	Slower attack cycle
Cavalry	Light Skirmisher	High movement speed and backline targeting	Open Field Invasions	Low sustained melee durability
Cavalry	Heavy Cataphract	High impact charge and enemy knockback	Frontline Disruption	High gold upgrade cost

Spearmen: Shield Wall vs. Anti-Cavalry

Spearmen serve as the primary counter to fast-moving mounted units and war elephants.

Fortified Shield Wall: Grants increased health and block chance. Choose this path if your primary focus is surviving high-tier defense waves, as it keeps mounted units from reaching your castle gate.
Anti-Cavalry Shock: Trades raw damage mitigation for higher damage multipliers against cavalry and elephants. Choose this branch for invasion maps where rapid elimination of hostile cavalry flanks protects your own archer line. Support these troops with hero active skills to offset their lower defensive stats.

Swordsmen: Armored Legionary vs. Shock Offense

Swordsmen dictate frontline stability and physical crowd containment outside your walls.

Armored Legionary: Provides superior armor values, large shields, and resistance to knockbacks. Deploy this branch to pin enemy melee waves beneath your wall archers and ballistas, preventing hostile siege engines from engaging your wall directly.
Heavy Shock Melee: Increases attack speed and armor shredding. Choose this branch when attacking colonies, where fast wall and gate breaches reduce the time your army spends under hostile ranged fire.

Archers: Rapid Volleys vs. Armor Penetration

Ranged wall units thin out approaching waves before they engage your ground troops.

Rapid Sagittarii: Maximizes rate of fire and volley width. This branch is best against early-to-mid wave swarms, hounds, and unarmored barbarian infantry, interrupting their run animations before they reach the frontline.
Piercing Crossbow: Trades attack speed for armor-bypassing projectile damage. Switch your focus to this branch when facing heavily armored late-game infantry and commanders that absorb standard arrow volleys without losing momentum.

Cavalry: Light Skirmishers vs. Heavy Cataphracts

Mounted units provide utility through mobility and formation disruption during field battles.

Light Skirmishers: Move quickly past frontline infantry to assassinate enemy catapult crews, ballistas, and backline archers. Deploy them early in invasion battles to stop hostile artillery from bombarding your ground troops.
Heavy Cataphracts: Act as a blunt disruption tool. Their charge knocks back enemy infantry lines to relieve pressure on your swordsmen, but their elevated gold upgrade cost makes them an expensive secondary priority compared to core infantry.

Recommended Squad Setups

Match your deployed squad composition to the current battle mode:

Castle Wave Defense: Deploy Armored Legionaries alongside Fortified Shield Wall Spearmen. Keep Rapid Sagittarii on the wall to clear incoming swarms while ground troops absorb cavalry charges.
Colony Conquest and Invasions: Lead with Heavy Shock Swordsmen to break the gate quickly, supported by Piercing Crossbows to snipe armored defenders and a reserve wing of cavalry to neutralize enemy artillery.