  High energy hadron-hadron collisions are discussed. It is argued that soft
collisions should involve in an essential way nonperturbative QCD. A way is
outlined how to calculate properties of high energy elastic hadron-hadron
scattering using field theoretic methods. The functional integrals occuring
there are evaluated using the ``stochastic vacuum model''. A satisfactory
comparison between theory and experiment is achieved. Then the question of
possible nonperturbative QCD effects in high energy hard hadron-hadron
collisions is raised. It is shown that some spin effects in the Drell-Yan
process may give a hint that such effects exist indeed in nature.
