court of Saxony, Oxenstiern was no doubt honourably received; but,
notwithstanding the personal efforts of the Elector of Brandenburg,
empty promises of continued friendship were all which he could obtain.
With the Duke of Brunswick he was more successful, for with him he
ventured to assume a bolder tone. Sweden was at the time in possession
of the See of Magdeburg, the bishop of which had the power of assembling
the Lower Saxon circle. The chancellor now asserted the rights of the
crown, and by this spirited proceeding, put a stop for the present to
this dangerous assembly designed by the duke. The main object, however,
of his present journey and of his future endeavours, a general
confederacy of the Protestants, miscarried entirely, and he was obliged
to content himself with some unsteady alliances in the Saxon circles,
and with the weaker assistance of Upper Germany.

As the Bavarians were too powerful on the Danube, the assembly of the
four Upper Circles, which should have been held at Ulm, was removed to
Heilbronn, where deputies of more than twelve cities of the empire, with
a brilliant crowd of doctors, counts, and princes, attended. The
ambassadors of foreign powers likewise, France, England, and Holland,
attended this Congress, at which Oxenstiern appeared in person, with all
the splendour of the crown whose representative he was. He himself
opened the proceedings, and conducted the deliberations. After
receiving from all the assembled estates assurances of unshaken
fidelity, perseverance, and unity, he required of them solemnly and
formally to declare the Emperor and the league as enemies. But
desirable as it was for Sweden to exasperate the ill-feeling between the
emperor and the estates into a formal rupture, the latter, on the other
hand, were equally indisposed to shut out the possibility of
reconciliation, by so decided a step, and to place themselves entirely
in the hands of the Swedes. They maintained, that any formal