运筹帷幄：《汉书·高帝纪》：‘上（刘邦）曰：夫运筹帷幄之中，决胜于千里之外，吾不如子房（张良）。’
History of Han·Biography of Emperor Gaodi: 'Liu Bang said:"As for planning strategies within a command tent to ensure victory on a battlefront a thousand li away, I would be no match for Zifang (alias of Zhang Liang)."
后因以称在后方决定作战策略，也泛指筹划决策。
devise strategies from the home front; (in a broad sense) devise strategies and make decisions
