There are a few simple and effective techniques in aikido but most are really, really hard to do on anybody who doesn´t take ukemi. Shihonage for instance does not strike me as a battlefield technique.
I think it is a perfectly reasonable "battlefield" technique. That is, given the right conditions and circumstances. High percentage move...no. On a battlefield with horses/cavalry, armor, and a mixture of people on both sides....swords, halbreds and everyone fighting enmass to force the tide of battle...I think you can make a good argument for Shionage.
Moving to modern day tactics. No so much when it consist a different dynamic all together. Might is be useful....possible. Do I practice it or do I ever work on it within my "Combatives" instruction or practice....no. I have other much more important things to spend my time on.