Magic Missile, Magic Missile, Magic Missile!
Sent on an assassination mission the night before a battle, we get to the target's tent, that of a high-ranking wizard. With a bit of skill mixed with a healthy dose of luck, we take out the guards and encounter the wizard in rather favourable conditions. That is, until he casts Lesser Globe of Invulnerability, giving him immunity from all spells below 3rd level.
'Dammit', says Salvador, 'I was just about to whale on him with 1st-level spells!'
Yeah, it definitely sounds like the 9th-level wizard dodged a bullet.