Let’s start with a remark by someone when Grant showed up to take over in Tennessee (I am paraphrasing): Grant didn’t come in with a lot of show and effort. And yet, when he came on the scene, everything seemed to start working like clockwork. He seemed to have a plan and everything he did played into that plan.
The plan, by the way, was mostly not Grant’s. The idea of attacking downstream positions to free up the Union lines was General Thomas’. The spontaneous attack on Southern positions at the end was not in anyone’s plan. However, Grant adopted and adapted to realities on the ground and changes in plan immediately. So, I suggest, Grant had (a) ability to reach out to a “customer” and change plans based on feedback – reactive agility – and (b) ability not just to adapt to unexpected change but also to incorporate it immediately in an overall strategy.
Now let’s reach back a little earlier, to the attack on Vicksburg. Catton in his superbly written history states that Grant during the winter was trying various methods to get downstream, and while almost all of these didn’t pan out, the constant trying of different things had the effect of bewildering his opponent Pemberton so that Pemberton perceived himself as being under potential attack from many directions at once. As a result, when the real attack happened, Pemberton was constantly one step behind. To me, that’s a bit like evolving the nature of a product constantly during development, compared to a competitor sticking to a fixed plan.
However – and, to me, here’s a key point – Grant was proactive rather than reactive. Not only was he constantly thinking about attacking; he was constantly thinking about changes in his attacks. At Vicksburg, he had already committed to operating without a supply line once across the river; he then changed his plans in order to attack Jackson once he saw an opportunity, and then turned around once Pemberton finally came out and changed his attack plans again in order to attack and defeat Pemberton “in detail”. So Grant could be proactively agile.
That Grant thought this way is apparently confirmed by an incident later in the war, at the Wilderness. Lee was pressing Grant hard, and staff officers accustomed to previous Union commanders were panicked over whether Lee could destroy the Union army. Grant blew up at them: some of them seemed to think, he said, that Lee was going to do a giant somersault and attack the army from behind. Instead of concentrating on what Lee was going to do to them, Grant said, they should concentrate on what they were going to do to Lee.
Now, I can’t say that Grant was completely agile – because he apparently sometimes did not spend enough time taking care of potential counter-moves by his opponents. Thus, in Shiloh, he chose to hasten the arrival of reinforcements for an attack rather than be on the scene getting folks dug in to receive one before he had a chance to attack.
One final thought – and here I admit I’m really reaching. An interesting characteristic of Grant’s attacks was that, given the chance, Grant would attack “up the middle”, but not to split the enemy’s lines, as Lee attempted to do with Pickett’s charge at Gettysburg. Rather, the main purpose was to hold the enemy in place as he then detached an equal force to hit the enemy on or behind one end, like a jab immediately followed by a roundhouse swing. If the enemy then detached too many to deal with problems on the end, the up-the-middle attack could then succeed, as in Tennessee. There is a vague analogy here to agile new-product development, in which one “fixes the competitor in place” with a strong product in an existing market, and then “hits the competitor on the end” with major innovative features, as the iPhone did.
I conclude that Grant was not a modern agile strategist, not fully. However, compared to others in the Civil War, and many generals since, he thought in a much more agile way. And note that it had nothing to do with how hard he worked. He spent less effort than most, and achieved much more. He was not efficient, he was effective. As Lincoln once said about Grant, I can’t spare this general, he fights.