What is the rising action in Hemingway's A Farewell to Arms?

The rising action structurally follows the Introduction,
which is when the central characters, Catherine and Frederic Henry, meet and unfold
their relationship to each other along with the beginnings of the story conflict. In
A Farewell to Arms, since it is, according to Hemingway, a love
story, at least part of the conflict--or one of the aspects of conflict--is the
difficulty of attaining an intimate, loving relationship during the horrors of world war
versus the idealized image of its attainment.

Since the romance, by
Hemingway's design, as stated by Edmund Wilson, is Hemingway's Romeo and
Juliet, the flirtation and building romance between
Henry and Catherine comprise the rising action that leads up to Henry's need to return
to the front. The rising action of their flirtation builds in Chapter 14, then becomes
earnest from Chapter 15 when Dr. Valentini examines him and schedules
surgery.

[Romeo and Juliet remark quoted by
Edmund Wilson in "Ernest Hemingway: Bourdon Gauge of Morale" first printed in
Atlantic Monthly 164 (July 1939).]