Picture two sides that have both agreed to this, even if neither one said so. The ground is chosen, the lines are drawn up, everyone can see what is coming, and nobody walks away. That is what the word pitched is doing: our source explains it as prepared, the way a camp or a tent is pitched before anything else happens. So the word does not just mean big and fierce; it means both sides stayed for it.
可以想成兩邊其實都點頭了，即使誰也沒說出口。地點選好了，陣也擺開了，大家都看得到接下來要發生什麼，而且沒有人走開。pitched 這個字做的就是這件事：來源把它解作「事先準備好的」，就像先把營、把帳篷架起來。所以這個詞不只是大和兇。它還說了一件事：雙方都留下來了。
From the word’s history
Wiktionary gives pitched battle as pitched ("prepared") + battle - the fight that was set up in advance rather than stumbled into.
來源把這個詞拆成 pitched（準備好的）加 battle，也就是「事先擺好陣的仗」，不是偶然撞上的衝突。
Wiktionary, "pitched battle"
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