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