andgrave gave them so
warm a reception that they could effect nothing; and just as Tilly was
preparing to follow with his whole army, to punish the unfortunate
country for the firmness of its sovereign, the movements of the King of
Sweden recalled him to another quarter.

Gustavus Adolphus had learned the fall of Magdeburg with deep regret;
and the demand now made by the Elector, George William, in terms of
their agreement, for the restoration of Spandau, greatly increased this
feeling. The loss of Magdeburg had rather augmented than lessened the
reasons which made the possession of this fortress so desirable; and the
nearer became the necessity of a decisive battle between himself and
Tilly, the more unwilling he felt to abandon the only place which, in
the event of a defeat, could ensure him a refuge. After a vain
endeavour, by entreaties and representations, to bring over the Elector
to his views, whose coldness and lukewarmness daily increased, he gave
orders to his general to evacuate Spandau, but at the same time declared
to the Elector that he would henceforth regard him as an enemy.

To give weight to this declaration, he appeared with his whole force
before Berlin. "I will not be worse treated than the imperial
generals," was his reply to the ambassadors whom the bewildered Elector
despatched to his camp. "Your master has received them into his
territories, furnished them with all necessary supplies, ceded to them
every place which they required, and yet, by all these concessions, he
could not prevail upon them to treat his subjects with common humanity.
All that I require of him is security, a moderate sum of money, and
provisions for my troops; in return, I promise to protect his country,
and to keep the war at a distance from him. On these points, however, I
must insist; and my brother, the Elector, must instantly determine to
have me as a friend, or to see his capital plundered." This decisive
tone produced a due impression; and the cannon pointed against the town
put an end to the doubts of George William. In a few days, a treaty was
signed, by which the Elector engaged to furnish a monthly subsidy of
30,000 dollars, to leave Spandau in the king's hands, and to open
Custrin at all times to the Swedish troops. This now open alliance of
the Elector of Brandenburg with the Swedes, excited no less displeasure
at Vienna, than did formerly the similar procedure of the Duke of
Pomerania; but the changed fortune