How do I reduce troop training cost and time?

Two Infrastructure research nodes directly cut what your army costs the economy:

• Rapid Recruitment: −37.5% training time at level 11
• Bannerman's Bargain: −30% training cost

There's also the global Efficiency (E) mechanic:

```

New cost = (1000 / (1000 + E)) × Original cost

```

In plain terms, +1,000 Efficiency ≈ −50% time/cost, and it stacks from several sources.

The Barracks, for its part, raises troop capacity. Go for Rapid Recruitment plus the Bargain first: you rebuild your army far faster each Reign, which is exactly where the re-grind hurts.