An user Galician
says…

Tiveron
Auxiliary
  que
Subordinating conjunction
  abastecer
Verb
  aos
 bandos contendentes  e
Coordinating conjunction
  sufriron
Verb
  as
Determiner
  súas
Determiner
 represalias.

They had to supply the contending sides and suffered their retaliation.
Words and sentences
New
tiveron

third-person plural preterite indicative of ter

New
que

New
abastecer

to equip, provide, furnish, supply

New
aos

to the, towards the

New
e

New
sufriron

third-person plural preterite indicative of sufrir

New
as

New
súas

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