 | Age: Bronze
Research at:The Goverment Center Benefit: Barracks units (including *Updated* Slingers) only count as half units toward your population, so you can essentially exceed the population limit by building Barracks units. |
For example, if the population limit is 50 and you build 20 normal units, you can build 60 Barracks units (for a total of 80 units) without exceeding the population limit.
The science of supplying armies on the march was called logistics. The Assyrians were the first great army to employ logistics consistently, and this allowed them to operate regularly at great distances from their home bases. Armies on campaign needed food, forage for animals, equipment, armor, and weapons. In most cases, food was acquired from the countryside through which the army was moving. But if an army paused to besiege a town, it exhausted local supplies quickly.
Food and forage had to be brought in or the army was forced to retire. The tools of logistics were supply wagons, pack animals, depots, and troops to keep the roads open. The great conquerors of antiquity, especially the Romans and Alexander’s Macedonians, mastered logistics.
 | Age: Iron
Research at: The Temple Benefit: Lets you instantly convert an enemy unit by sacrificing one of your Priests. You cannot use Martyrdom to convert an enemy Priest. |
To convert a unit using Martyrdom
| 1. Click a Priest, and then click the enemy unit to convert.
2. Press DELETE. The Priest is deleted and the unit is instantly converted. | 
|
Fervent believers who refused to renounce their religion at the risk of death were called martyrs. Witnessing the death of a martyr had a powerful effect on anyone of weak faith. The cause of Christianity, for example, was strengthened by the spectacle of believers who willingly chose death over conversion to a pagan religion then accepted by the Romans.
 | Age: Iron
Research at: The Storage Pit Benefit: +1 infantry armor against Ballista, Helepolis, and missile weapons. |
Only infantry and Academy units benefit from this technology. The Romans adopted a tall rectangular shield that gave them advantages in battle when used properly. The size of the shield protected more of the body. The Romans fought in tight rectangular formations of approximately 100 men called maniples.
The shields of the men in the maniple presented a continuous front, or shield wall, which protected them greatly from missile fire. They developed a formation variant called the Testudo (or turtle). In this formation, the shields covered all four sides and the heads of the men, allowing them to advance under missile fire. This was useful advancing toward a gap in an enemy wall, for example.
| Age: Iron
Research at: The Temple Benefit: Increases Priest's healing rate. |
Through trial and error, humans learned that certain herbs and plant products possessed medicinal qualities. The invention of writing made it possible to record this knowledge and pass it on to following generations by a method other than oral transmission.
| The science of medicine progressed gradually, improving the quality of life and average life expectancy. |
|
