my 2 cents
ceithearn (light infantry)
formed bulk of every irish army , being armed with javelins , spears , swords , dirks, short-bows ...Some had targes, padded jerkins, caps and helmets , they fght in speed and surprise, so no much armour they used.
ceithearn tigh (household kern)
best kern were retained by chiefs to serve as household kern "ceithearn tigh" , kind of police force of "military thugs", they can use spear, glaive or axe .
Galloglaich
very capable warriors , choosen from strongest men of country , nigthmare to english soldiers, they used huge two handed axe called "spar" , axe was considered most used weapon they used , the axe was 1,8 m leght.
Saighdeoiri (archers)
Ireland didnt use bow a much , these archers come in small numbers,
Hobilars (light cavalery)
Irish mounted skirmisher is described as "bearheaded man with long black hairs , wearing irish jacket and leine , having irish dager and dart in his hand"
Marcschluag (elite bodyguards)
most prestigious of Irish soldier types , all members of nobility, some were also merceneries .
-they rode without stirrups , and with only stuffed cushion instead saddle.
-Equimpment: mail shirt, jacket , quilted jerkin, targe and iron skullcap.
Weapons: Sword with a stount chopping blade, dirk and light lance (held over the head during the charge , becouse of stirrups absence.
this is what we use for Patria Libera