Who are the “idols of our hearts” that twain refers to in the prayer?

The enemy's leaders.

Explanation:

" O Lord our Father, our young patriots, idols of our hearts, go forth to battle-- be Thou near them! With them -- in spirit -- we also go forth from the sweet peace of our beloved firesides to smite the foe (...)"

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.

people had jobs and began to work. that’s why the commercial revolution was great.