it demands that you suffer the dreadfulness of war from both sides 
(ROOT (S (NP (PRP it)) (VP (VBZ demands) (SBAR (IN that) (S (NP (PRP you)) (VP (VBP suffer) (NP (NP (DT the) (NN dreadfulness)) (PP (IN of) (NP (NN war))) (PP (IN from) (NP (DT both) (NNS sides))))))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ))) (PP (IN ) (NP (DT ) (NNS ))))))))))