Latin - Caesar Crosses The Rubicon

gelidas (icy)  = the word conveys the hostility of the situation.

superaverat (conquer)  = the word conveys his intentions in Rome.

ingentisque (huge) = emphasizes the size of his plans.

parui (small) = calling the Rubicon small contrasts to the 'huge' vision of Rome, it conveys Caesar's disregard for the importance of the river.

trepidantis (anxious) = conveys agitation.

Clara & obscuram ( clear & dark) = two contrasting words together.

maetissima = superlative emphasizes her sorrow

turrigero ( turreted) = vision is turreted as she represents a city. The white hair shows great age - through stress.

lacertis (torn) = appearance is shocking, description conveys she has suffered abuse.

quo (where) = repetition of questions beginning with quo highlights her surprise at them going further. Emphatic position of the word, 'ultra'(further) also shows this. 

si (if) = repetition of si shows her disbelief that they can be are law-abiding citizens.

horror (dread) = expresses the characteristic shock and dread at seeing the vision. the violent verb 'struck' emphasizes this.

Caesar's distress is made vivid by its physical nature - his limbs are stuck etc.

languor (weakness) = emphatic position at the beginning of the sentence.

extrema (edge…