I'd have thought their deaths unavoidable due to being continually ordered to run over 500m of open land while in the sights of several machine-gun nests....Even after the high command knew that the creeping barrage was a non-starter after the first few assaults.
But that's me.
Necessary....yeah, alright.
Yes, and that occurred early in the war, when they simply knew no better. Yes, it took time to adjust, but if you actually took the time to understand how that position arose, you would understand it - they arrived on the battlefield, found themselves totally unprepared for how defensive war had become, used old tactics no longer relevant and didn't have a clue how to adjust, and were just determined to hold the stalemate and try to breach them, which we tried with Ypres, Somme - and eventually achieved it at Amiens which started the 100 Day Offensive.
Without consistently adapting and trying to breach the Germans, we possibly never would. The generals had to do it.