Arcelor, the Luxembourg-based steel company that has in the past preferred not to use bank advisers, is wheeling out the big guns to defend it against the €18.6 billion ($22.1 billion) hostile bid from Mittal Steel. It has just hired Morgan Stanley, which will join BNP Paribas, Deutsche Bank, UBS and Merrill Lynch in advising it. Most of the main advisory firms are involved in the hostile bid on one side or the other. Mittal Steel is being advised by Credit Suisse, Goldman Sachs, HSBC, Société Générale and Citigroup.