President Bush’s decision to increase combat troop levels in Iraq in January 2007 sent a clear message that he was determined not to abandon a people to death squads and terrorists. We will need the same commitment to helping the people of Afghanistan succeed, but that does not mean we will achieve it with the same tactics or strategies.

The way forward in Afghanistan will need to reflect the current circumstances there — not the circumstances in Iraq two years ago. Additional troops in Afghanistan may be necessary, but they will not, by themselves, be sufficient to lead to the results we saw in Iraq. A similar confluence of events that contributed to success in Iraq does not appear to exis...

President Bush’s decision to increase combat troop levels in Iraq in January 2007 sent a clear message that he was determined not to abandon a people to death squads and terrorists. We will need the same commitment to helping the people of Afghanistan succeed, but that does not mean we will achieve it with the same tactics or strategies.

The way forward in Afghanistan will need to reflect the current circumstances there — not the circumstances in Iraq two years ago. Additional troops in Afghanistan may be necessary, but they will not, by themselves, be sufficient to lead to the results we saw in Iraq. A similar confluence of events that contributed to success in Iraq does not appear to exist in Afghanistan.

What’s needed in Afghanistan is an Afghan solution, just as Iraqi solutions have contributed so fundamentally to progress in Iraq. And a surge, if it is to be successful, will need to be an Afghan surge.

Its borders are threatened by terrorist sanctuaries in Pakistan. Fractured groups of Pashtun tribesmen on both sides of the Afghanistan-Pakistan border do not yet appear willing to unite and take on the insurgents in their midst, as Arab tribes did in Iraq.

Further, Afghanistan has a long history of defeating foreign armies that sought strength in numbers. The Soviet Union tried to occupy Afghanistan with hundreds of thousands of troops — and withdrew, defeated and broken. More United States troops could raise tensions, particularly in Afghanistan’s Pashtun south, where the insurgency is strongest.

Only capable indigenous forces can ultimately win an insurgency. Afghan forces, backed by coalition troops, will need to move into the most violent areas to secure and protect the local population, enabling Afghans to cooperate with their government without losing their lives.

The current suggestion of “opening negotiations” with the Taliban may well win over some low- and mid-level supporters, but if history is any guide, offering the hand of peace to hardened fanatics is not likely to prove successful. Aggressive action against Taliban and Qaeda sanctuaries in Pakistan will need to continue. Pakistani officials will have to isolate any factions in their military and intelligence services that are sympathetic to the Taliban.

In a few weeks, the new commander in chief, Barack Obama, will assume the responsibility of leading a nation at a time of war. Time and flexibility are the two constants of military success. In a struggle with an adaptable, thinking enemy, t...

The current suggestion of “opening negotiations” with the Taliban may well win over some low- and mid-level supporters, but if history is any guide, offering the hand of peace to hardened fanatics is not likely to prove successful. Aggressive action against Taliban and Qaeda sanctuaries in Pakistan will need to continue. Pakistani officials will have to isolate any factions in their military and intelligence services that are sympathetic to the Taliban.

In a few weeks, the new commander in chief, Barack Obama, will assume the responsibility of leading a nation at a time of war. Time and flexibility are the two constants of military success. In a struggle with an adaptable, thinking enemy, there is no single template for success. More is not always better. One size does not fit all.

The singular trait of the American way of war is the remarkable ability of our military to advance, absorb setbacks, adapt and ultimately triumph based upon the unique circumstances of a given campaign. Thus it has been throughout our history. And thus it will be in Iraq and Afghanistan, if we have the patience and wisdom to learn from our successes, and if our leaders have the wherewithal to persevere even when it is not popular to do so.

Donald H. Rumsfeld was the secretary of defense from 2001 to 2006.