[QUOTE=Freddy the Pig]
Ugarte was a dolt to whom all Frenchmen looked alike and had unpronouncable names. The letters were really signed by General Petain but Ugarte garbled his name.
That’s my theory, anyway.
[/QUOTE]
Heh, I like the way you think – although your theory would make much more sense if the signatory was Pierre Laval, a die-hard French Nazi and the prime mover behind Vichy’s active collaboration with Hitler, instead of Petain, whose motivations for serving as the figurehead leader had much to do with his social conservatism (think “family values”), abhorrence of anarchy and senseless violence, and his determination to minimize suffering and help France weather their occupation.
Besides, Laval rhymes with DeGaulle. 
My interpretation of Ilsa Lund is completely at odds with that of Stranger on a Train. The way I see it, every major character in Casablanca is a metonymic stand-in for his or her country: Rick for the not-yet-fully-committed USA (or at least Brooklyn), Louis for urbane Vichy France (his pragmatic “but personally, I will take what comes” is a classic statement of the Parisian mentality), Ilsa for neutral Sweden, Victor Laszlo for occupied Mitteleuropa (be it Hungary or Bohemia), and Stroesser for Deutschland.
Considered in this way, Ilsa is a remarkable figure in her own right from the moment of her introduction, as a Swede who has relinquished the relative security of her country’s official neutrality (if rather cozy relationship with Germany), in favor of living a most unsettled and risky life in the Resistance demimonde, perpetually making do on the fly, in whatever country her husband is compelled to visit. Her role is singularly liminal in a film abounding with characters of uncertain loyalities and characters, for if Ilsa is neither a typical Resistance figure, nor is she “merely” a loyal wife. In fact, to be known as merely a wife would mark, in a way, an improvement in and definition of her status. As it is, her marriage to Victor has been kept a most closely guarded secret, even from Victor’s and her closest friends in the Resistance, for her protection (and also his). Thus by accompanying Victor from one corner of Europe to the other, Ilsa is willing to be known, vaguely, as a shadowy companion – perhaps a comrade or assistant here, or a lover or ex-lover there – but never enjoying the respectability of a wife, even amongst their friends.
And just what is it that Ilsa does, anyway? That’s left largely undefined, although there’s a few tantalizing hints dropped along the way. We know from various sources, including Victor himself, that she’s crucial to his work as a Resistance leader, and that the two of them have shared many vital and dangerous missions together. It’s also suggested that her support is more emotional than anything (she’s what keeps Victor going, making it possible for him to keep up the good fight). This, in spite of the logistical difficulties that a couple must face as opposed to a solitary agent working (and hiding, and using fake I.D.s…) alone. Yet Victor and Ilsa are both willing to undertake that baseline risk to to them both. There must be some compelling reason for this, even if it’s left unexplained.
But can’t we expand upon this rudimentary sketch based on what we observe about Ilsa in the film, supplemented by some reasonable conjecture? Ilsa’s nationality probably offers several advantages or resources to her husband’s work: her Swedish citizenship is neutral cover (and refuge), as is her physical presence at times, when it may be easier to pass as a couple. No doubt she also possesses Scandinavian contacts useful to the continental Victor.
More importantly in the film, Ilsa is gifted with an enigmatic sexual magnetism, in which she is both, clearly, a sophisticated and capable woman of the world, while simultaneously possessing a very youthful innocence and emotionalism. Her psychological duality could be read as an example of the archtypal “madonna/whore” dualism of female sexuality. This becomes apparent in the film when we understand that although her passion is for Rick, she had left him behind in Paris to rejoin her husband. Although her love holiday in Paris with Rick was premarital and technically adulterous, it was purely motivated by love and passion in a way that her wifely loyalty to her husband might not be. (It was also, almost literally, a lifesaving event for Ilsa, who had all but lost her will to live after believing she had lost her husband.) In effect, Ilsa had proved willing to sacrifice her secret love, and the source of her rejuvenated love of life, in order to serve (whore herself) for a greater good, in an alliance determined by her head rather than her heart.
But Ilsa shows us that she’s capable of feigning a more conventional kind of whoring when doing so serves her husband for a pointedly specific purpose, although she paradoxically proves incapable of dismissing her emotional needs forever. To secure the letters of transit that would save her and her husband, she first secretly visits Rick in a friendly, nostalgic mein; when that fails, she proves willing to threaten him with deadly force. But her friendly overture was not entirely mercenary, as she’s unable to follow through with her threat; ultimately, Ilsa offers herself to Rick and forces him to decide their fate. Torn asunder by her head and heart’s conflict, Ilsa simply cannot choose any longer between Victor and Rick.
It’s at this point in the film that Rick’s prior misreading of Ilsa is resolved, allowing him to reconcile himself to her true loyalties and regain his own youthful antifascist idealism. Rick’s bitterness over his earlier abandonment by Ilsa was exaggerated by his misreading (promoted by Ilsa herself) of her motivations as emotional (perhaps failure to commit, perhaps a love rival, but left maddeningly vague), rather than idealistic (her rejoining her husband). And just why didn’t Ilsa make the nature of her dilemma clear in her message to Rick at the train station? Probably an excess of secrecy born of caution concerning Victor’s identity and their marriage. But I always thought that her motivation could have been nobler and more self-sacrificing in a way: that she though that an inadequate explanation might help him get over her easier, by hating her more. If that was her intent, though, it sadly backfired, as Rick settled into a post-smuggling identity as an embittered, cynical “drunkard” and “saloon owner,” who can’t even bear to hear their song anymore.
Which brings us to a final paradox produced by these often paradoxical characters: it requires Ilsa’s whoring herself and psychological collapse to make Rick see her inner conflict, between her idealistic support of her husband and the Resistance, and her passionate love for Rick. His understanding that she really did love him (and still does) leads to an empathetic understanding of her sacrifices in serving alongside Victor, and why that work is worth his support, too. If she could give up her greatest love for a cause, then so will he now, when she’s unable to choose and forces him to do the thinking for them both.
What Ilsa’s machinations suggest is that, her final psychological breakdown aside, she can function pretty well as a spy in her own right. What would not be known until many years after WWII (and the making of Casablanca) is the role played by women in the Resistance and the allied intelligence networks operating in the European theater. There were, in fact, a great many “Ilsas” working in various capacities for MI6, the French Resistance, and other organizations. Some of the most successful spies of WWII were Englishwomen based in France and elsewhere; some were young and comely, but others were middle-aged (or older) and matronly, whose official identities were as nannies or such. They were greatly assisted in their work by the prevailing sexism on the part of many Germans and their collaborators, who were often thus blinkered in their comprehension. It is a mistake perhaps too easily made even today…