Why was Daniel's father crucified in "The Bronze Bow"?

Daniel's
father was the overseer of the vineyards.  He had a brother, "younger than he was, and they
were very close".  When this brother, Daniel's uncle, had his first son, he did "a
very foolish thing...it was almost time for the taxes, (but) he took part of the money he had
saved and bought his wife a present...he planned to find extra work and make up the
money".  Unfortunately, the tax collector came early that year, because the Romans needed
the money to build a new section of road. Too ashamed to ask his brother for help, Daniel's
uncle tried to argue with the tax collector, but the soliders came to arrest him.  When he
heard, Daniel's father raised the money for the tax, but Daniel's uncle "had lost his head
and tried to fight his way out" of prison, and was sentenced to serve time at hard labor in
the quarries to work off his debt.

Daniel's uncle's wife was "almost out
of her mind" with grief and desperation, and, at her behest, Daniel's father, "a
peaceful man", armed himself and tried to force his brother's release by attacking the
convoy which was transporting the prisoner to the city, but he was captured.  The Romans
"wanted to make an example for the village", and, in a grisly act of
retaliation, crucified Daniel's uncle, father, and all the others involved, six in all (Chapter
7).