So a look at the breakdown for troops and their progression through each faction's various trees.
Increase in number reflects generally an increase in quality, and certainly cost, where "1" is cheapest and "5" most expensive. Troop tree 1 is recruitable in 'villages' to all factions, and trees 2-5 are exclusive to faction only.
Roman Empire
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1. Auxilia Peditatus --> Auxilia Peditatus Salararius.
2. Auxilia Sagittarius --> Auxilia Sagittarius Salararius.
\ --> Auxilia Arcuballistatus
3. Legio lanciarius --> Legio lanciarius Salararius
4. Legio milites --> Legio milites Salararius --> Cohors Praetoria
5. Legio Speculatores --> Equites Promotus --> Equites Contarius
\ --> Equites sagittarius
====================================================================
Gallic Empire
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1. Foederati Peditatus --> Foederati Peditatus Decanus
2. Foederati Verutatus --> Foederati Sagittarius
\ --> Foederati Verutatus Decanus
3. Legio lanciarius --> Legio lanciarius Salararius
4. Legio milites --> Legio milites Salararius --> Cohors Praetoria
5. Foederati Equites --> Foederati Equites Ala
\ --> Foederati Equites Verutatus
====================================================================
Palmyrene Empire
====================================================================
Auxilia Numerus --> Auxilia Numerus Decanus
\--> Auxilia Numerus fundatores
Auxilia Sagittarius --> Auxilia Sagittarius Salararius.
\--> Auxilia arcuballistatus
Legio lanciarius --> Legio lanciarius Salararius
Legio milites --> Legio milites Salararius
Equites Promotus --> Equites Contarius --> Equites Clibanarii
\ --> Equites sagittarius
====================================================================
Sassanid Empire
====================================================================
Paighan --> Paighan-Salar
Paighan Takabara --> Takabara --> Takabara asabari
\--> Sang andaz
Kamandaran --> Kamandaran-Salar
Dailamites --> Dailamites-Salar
Savaran --> Savaran-Spahbod --> Savaran Grivpanvar
\--> Sardar --> Sardar-Spahbod
====================================================================
Increase in number reflects generally an increase in quality, and certainly cost, where "1" is cheapest and "5" most expensive. Troop tree 1 is recruitable in 'villages' to all factions, and trees 2-5 are exclusive to faction only.
Roman Empire
====================================================================
1. Auxilia Peditatus --> Auxilia Peditatus Salararius.
2. Auxilia Sagittarius --> Auxilia Sagittarius Salararius.
\ --> Auxilia Arcuballistatus
3. Legio lanciarius --> Legio lanciarius Salararius
4. Legio milites --> Legio milites Salararius --> Cohors Praetoria
5. Legio Speculatores --> Equites Promotus --> Equites Contarius
\ --> Equites sagittarius
====================================================================
Gallic Empire
====================================================================
1. Foederati Peditatus --> Foederati Peditatus Decanus
2. Foederati Verutatus --> Foederati Sagittarius
\ --> Foederati Verutatus Decanus
3. Legio lanciarius --> Legio lanciarius Salararius
4. Legio milites --> Legio milites Salararius --> Cohors Praetoria
5. Foederati Equites --> Foederati Equites Ala
\ --> Foederati Equites Verutatus
====================================================================
Palmyrene Empire
====================================================================
Auxilia Numerus --> Auxilia Numerus Decanus
\--> Auxilia Numerus fundatores
Auxilia Sagittarius --> Auxilia Sagittarius Salararius.
\--> Auxilia arcuballistatus
Legio lanciarius --> Legio lanciarius Salararius
Legio milites --> Legio milites Salararius
Equites Promotus --> Equites Contarius --> Equites Clibanarii
\ --> Equites sagittarius
====================================================================
Sassanid Empire
====================================================================
Paighan --> Paighan-Salar
Paighan Takabara --> Takabara --> Takabara asabari
\--> Sang andaz
Kamandaran --> Kamandaran-Salar
Dailamites --> Dailamites-Salar
Savaran --> Savaran-Spahbod --> Savaran Grivpanvar
\--> Sardar --> Sardar-Spahbod
====================================================================