The 'war on terror' and new technology, 2001 to 2011

After 11 September 2001 the world's most powerful armies found themselves fighting enemies without uniforms or front lines. New technology changed how wars were fought, but not always who won them.

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9/11 and the invasions

On 11 September 2001 the terrorist group al-Qaeda hijacked airliners and attacked New York and Washington, killing nearly 3,000 people.
The USA declared a 'war on terror'. In October 2001 US-led forces invaded Afghanistan and overthrew the Taliban, who had sheltered al-Qaeda.
In March 2003 a US-led coalition including Britain invaded Iraq and removed Saddam Hussein within weeks, using overwhelming air power and precision weapons.

Asymmetric war

Quick victories turned into long insurgencies. Fighters avoided open battle and used improvised explosive devices (IEDs), ambushes and suicide bombings, which killed many soldiers and civilians.
This is asymmetric warfare: a weaker side uses unconventional methods against a stronger one.
Coalition forces turned to counter-insurgency, trying to protect civilians and win local support, as in the US troop 'surge' in Iraq in 2007.

New technology

Drones (unmanned aircraft) were used for surveillance and for targeted strikes, including in Pakistan, without risking pilots' lives, though civilian deaths caused controversy.
Precision-guided weapons and satellite surveillance allowed accurate strikes.
Cyber warfare emerged: the Stuxnet computer worm, discovered in 2010, damaged Iran's nuclear equipment.
In May 2011 US special forces killed al-Qaeda's leader Osama bin Laden in Abbottabad, Pakistan. In 2011 NATO air power also supported rebels in Libya.
Worked example

Explain why the US-led coalition found it hard to win in Iraq after 2003.

  1. The regular army was defeated quickly, but insurgents did not fight open battles.
  2. They used IEDs, ambushes and suicide bombings, blending in with the civilian population.
  3. Advanced technology could not easily tell fighters from civilians, and civilian deaths turned local people against the coalition.

Answer: Insurgents used asymmetric tactics that high-tech weapons could not easily defeat, and civilian casualties cost the coalition local support.

Key idea

9/11 (11 September 2001): al-Qaeda killed nearly 3,000. Afghanistan invaded (October 2001); Iraq invaded (March 2003). Long insurgencies used IEDs and suicide bombings: asymmetric warfare, met by counter-insurgency (Iraq surge, 2007). New technology: drones, precision weapons, satellites, cyber warfare (Stuxnet, 2010). Bin Laden killed in Abbottabad (May 2011).

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2 more questions

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  1. Which country was home to the Taliban government that sheltered al-Qaeda?

    1. Iraq
    2. Iran
    3. Pakistan
    4. Afghanistan
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    Answer: Afghanistan

    The US invaded in October 2001.

  2. US-led forces invaded Afghanistan after the 11 September attacks in which year?

    Show the answer

    Answer: 2001

    The invasion began in October 2001.

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Sources and references

Checked by the GCSE-ready editorial team, 16 October 2026. Last updated 2 October 2026. Spotted a mistake? Tell us and we will fix it.

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