Question

review the passage. the allusion is shown in bold.
as the days continued to lengthen and warm in april 1864, the realization that the army of northern virginia, from a purely physical standpoint, faced a herculean task even to survive surfaced. men and horses had eaten barely enough through the winter to stay alive. grants delay in opening up the spring campaign was greeted favorably in that the horses could get some forage from new grasses. the morale of lees army under these circumstances was amazingly high.
from robert bluford, jr., the battle of totopotamoy creek. copyright 2014 by robert bluford jr.
what is the effect of the allusion on the passages meaning or tone?
it suggests that the soldiers were noble and brave.
it indicates that survival would be very difficult.
it emphasizes the soldiers dedication to their cause.

Explanation:

The allusion "herculean task" refers to the extremely difficult labors of Hercules in Greek mythology. In the passage, it is used to describe the situation of the Army of Northern Virginia. The context mentions that men and horses had barely enough to eat over winter. So, the allusion emphasizes the extreme difficulty of their situation (survival being a very hard task). It's not about nobility/bravery (no mention of heroic deeds in that sense) or dedication (the focus is on the physical hardship of survival).

Answer:

It indicates that survival would be very difficult.